Fire is good for RSF because of the self rez but SS/Elec your best bet with resistance to all damage types and a tier 9 its awesome 
thePhilosopher Martial Arts/Regen/Fire Scrapper
theRegulator Empathy/Energy/Soul Defender
Total Inertia Ice Blast/Kinetics/Psy Corruptor
Total Inferno Ice Blast/Thermal/Leviathan Corruptor
I have a fire/fire and a SS/Elec.
My first vl 50 was my fire/fire Brute. I did the LRSF 5 times with him and all I can say is that the tier 9 is useless. If you wanna a good team to finish the SF you need at least 2 corrs, maybe more. And they will probably be able to rez you. Besides, Brutes are the last ones to fall in the final mish (usually), and why would you use a self rez if almost everyone is dead?
Now, the elec tier 9 is handy. Usually I charge with 4 purples and keep using more as they run out. There will come a time in the fina battle that most of the team will fall and the rezzes will begin. It's your job to get the attention of the Heroes and Power Surge will allow you to stand and fight.
Of course, I'm taking about a regular LRSF team. I've been on teams in which we killed all the Heroes in the first run.
One more thing:
Psi damage - Numina, Sister Psyche
Nrg damage - Synapse, Positron, Citadel
Elec armor has Psi res and a huge Nrg res.
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Fire is good for RSF because of the self rez
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I'd say the best thing about /Fire is the availability of Healing Flames, especially if you have a Kin on the RSF with you. As long as you have at least one Corr with res shields to drop on you, /Fire doesn't fare too badly. Self-rez is certainly useful, but ideally you'd be hoping not to have to use it. 
Fire/ isn't the best choice of primaries though.
Of the listed choices, SS/Elec is the pick of the bunch - don't expect to be holding any of the aggro but you'll probably be standing longer than most because of your Energy Resists, and Rage ensures a healthy level of damage output. Psi Res is negligible: Numi, Psyche, Swan and Malaise go down pretty swiftly and only Psyche does any real noticeable damage. Psi Res is nice to have, but there's no way to buff it to be really useful outside of orange insps/temp power (Enchantment of Serafina iirc).
@Synaesthetix
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Got 2 50 Brutes who have done the lrsf 5 times each,
An EM/EA, has no problems, uses less purps because of having around 30% Def to start with.
A Stone/Stone, Does real fine to, especially as you are usually with 4-6 Corr's usually 1-2 rads and at least one /kin in it to so all usual probs overcome.
Been on teams with all types of brutes, and all do well probably due to the corr support to be honest, so any will do.
My ss/fire has done it many times with no problems, make sure you bring along a few corrs and your laughing.
There is no "best" power set a brute for the lrsf its falls down to the team your with and how you play imo.
If i decide to go with SS / Elec, is it worth me picking up Tough and Weave? for extra survival. What about Assult, Tactics and then vengeance, as i have heard vengeance can be a real help.
For ss/elec tough and weave wouldnt be worth it but if you can fit into your build tough would help, as for vengeance this is must for the lrsf but again only pick it up if you can fit into your build as you will find that corrs or mm will have it most of the time.
Don't worry about Weave... the defense bonus is negligible and /elec is about resistance. Tough is a good ideia, but get it after Aid Self.
Leave the Leadership Pool to Corrs and MMs. They have the biggest bonuses, specially Corrs. For Brutes, it's just a waste of End IMHO, specially with 3-4 corrs on the team.
Think the def from weave for brutes with 3 even SO's in it works out at around 5.85%, worth it for /inv or /ea as they have a def component to build it onto if they can fit it in builds, but for res brutes probably not all that worth it really
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Don't worry about Weave... the defense bonus is negligible and /elec is about resistance. Though is a god ideia, but get it after Aid Self.
Leave the Leadership Pool to Corrs and MMs. They have the biggest bonuses, specially Corrs. For Brutes, it's just a waste of End IMHO, specially with 3-4 corrs on the team.
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I agree with that... And I don't know if SS is the best pool for rsf, because of s.o.b like Statesman, who's very very resistant against smash/letal.
/stone is the RSF brute build for very good reasons, its not a particularly well planned out SF and you really cant beat 1 granite and 7 corrs, we run it in just over an hour these days but its a shame it doesnt cater to the other ATs well.
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Your fire/fire should do great, despite what people think its single-target DPS is not too far from nrj melee before HOs, and unlike SS it's not heavily resisted by the Freedom Phalanx.
Don't let people who say "/stone and 7 cors is the ONLY efficient way" get to you, I've done plenty of 50mn runs 6 months ago (back when they were 54) without any granite, with no more than 4 cors and without any temp powers while those same people were still yelling "you NEED nukes/shivans to do it!".
You've done it without Nukes and Shivans? I wanna join your team, cause I wont temp power gather for the PvE game in PvP zones.
Oh and Fire Melee does indeed have very good ST damage, its only now I'm trying other brutes that I realise how good my FM brute really is
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So i could perhaps run a decent Fire/Fire brute if i got maybe Tough and Weave in?
Fire/Fire is decent on its own, it just doesnt have a god mode. And with the recent changes on Healing Flames, he is even better.
Forget about Weave. Though is a good ideia, although I prefered the Presence Pool for damage mitigation. And it has a mini-Taunt.
Ok so i have 3 brutes
Elec / Elec and.
Fire / Fire..
SS / Elec...
would either of these be good for the LRSF or shall i start a new one, i no EM / Stone and SS / Stone is good, but are there any others?