lol. This concept is pure win.
Either primary works great with /SR. DM/SR is one of the best at soloing AVs and DM's Siphon Life helps fill the no heal hole in /SR. The best ST attack chain(Smite>MG>Smite>SL) requires quite a bit of +recharge, which makes it fairly expensive to build towards, though Quickness in SR helps attain it more easily than other secondaries.
FM is also great for AVs, and doesn't need nearly as much +recharge to be able to use it's highest dps, or 10% less dps and better eps, ST chain. FM/SR is known as the least expensive combo for AV soling due to this(as well as SR's easy def softcapping). FM also brings excellent AOE ability to the table with Fire Sword Circle. Breath of Fire is a narrow 30 degree cone, though if your at all good at positioning for DM's Shadow Maul or the vet reward Sands of Mu, then getting 4+ targets in it's aoe is easily accomplished. My FM/SR is 32 and is my new favorite alt.
Best of luck to you, and please post a link to a pic of your lemur hero. 
I forgot to mention that FM would likely be better suited to an Atomic concept. DM is shadowy and dark, whereas FM is explosions with the non-sword attacks. If you're avoiding sword attacks, you can aim for the attack chain Incin>Scorch>Cremate>Scorch(145% recharge in Incinerate), though you should still take FSC for it's excellent aoe power.
I'd definitely say do fm/sr he's got Atomic fire and speed!!!
50's: Heroes: Ozmeth DB/WP; Black Decker DM/Regen; Shado-Strike DM/SR Scrapper (13 AV soloed); Desert-Shock Claws/Elec Scrapper; Shado-Shriek Dark/Son Def
Villains: Bokken Nin/Nin
Current project(s):
Where's Lemur_Lad when you need him?
When there is no room left in Hell, the Dead shall walk the earth.
I'm with these guys, go Fire/SR. I've got one of those in the late 30s and it's a BLAST to play, quite literally.
...Too corny?
Anyway, Fire is a good choice if you are going for an atomic theme, especially with what is coming in issue 16 you should be able to make his fire GREEN! As far as the set itself goes, Fire Melee is just really good for doing what Scrappers are all about, pure unadulterated melee damage in large red numbers.
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Where's Lemur_Lad when you need him?
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i was thinking the exact same thing
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Need some help. He's gunna be comedy and have a variety of 'Atomic' powers.
Which primary do you think will work best?
I'm thinking either fiery or darkness.
Which primary overall would work best with SR?
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Treelo goes postal oh know
Pinnacle
Langar Thurs-Katana/SR 50; Hejtmane-DM/DA 50
Rogue Spear-Spines/DA 50; Hypnosis-Ill/Rad 50
Sir Thomas Theroux-DM/SR 50; Melted Copper-Fire/Shield 50
Byzantine Warrior-DB/ELA 50;Blade Tempo-50 DB/EA
Atomic Lemurs seem like blasters to me... *shrug*
I gotta make pain. I gotta make things right. I gotta stop what's comin'. 'Least I gotta try.
Need some help. He's gunna be comedy and have a variety of 'Atomic' powers.
Which primary do you think will work best?
I'm thinking either fiery or darkness.
Which primary overall would work best with SR?
As I was going up the stair
I met a man who wasn't there.
He wasn't there again today.
I wish, I wish, he'd stay away.
-- Hughes Mearns (1875-1965) The Psychoed
Saint Fourth the Patron Saint of Dark Poetry