I recommend getting hasten and superspeed, hasten will stack with siphon speed nicely, and superspeed will provide you fast movement when you need it, since it doesn't have activation time like IR, and can be used anywhere unlike siphon.
You should also take fitness pool and get stamina at L20, it will help with your endurance until you get transference.
As for powers to take, I'd get everything but repel, and possibly ID, from kinetics, and all but voltaic sentinel from elec.
Personally, I'd suggest something different. You best bet being a kinetics is to stay close and in the heat of a fight, hence, Zapp becomes a bit less useful.
I would also like to suggest that Stamina and a travel power are very good ideas to have until you feel confident you can respec out of them.
Im very new to defenders but have a kin/elec at lvl 27 at the moment.
I agree entriely that this type of defenders excels in melee range, providing heals, end replenishing(transference) and damage buffs.
I use short circuit and lightning ball extensively, and now with the addition of transference i can keep a herded mob extremely low on end, if not empty.
I do not need stamina at all now i have transference, I have no travel power, multiple stacked siphon speeds and inertial reduction are more than enough.
get hasten it makes everything even faster. 
I also run tactics for accuracy and use hover to minimise knockback problems.( stacked siphon speeds and hover=fly speed approx with no supression or drift) 
i will say that pre SO's, tactics and inertial reduction, travelling was a pain if siphon speed missed, it was quite hairy trying to siphon a + 3 if he was the only mob around, and I frequently ended up in hospital !
This toon has a frantic playstyle as is one I almost exclusively play in teams.
It is great fun, enjoy !
My level 40 defender has the following powers.
From Kin the powers I have are:-
Tranfusion ( 6 slotted and spammed , 1xACC,3x Heal,2x RCG )
Siphon Power ( 4 slotted and spammed )
Siphon Speed ( ditto )
Speed Boost ( people love this, I find it annoying to give out though, 1 slot of end mod )
Increase Density ( 1x Resist slot, I got this because I would like it on me )
Transference ( 6 slot, 1xACC, 3 recharge, 2x end mod IIRC )
Fulcrum Shift ( spammed 1xACC, 3xRCG IIRC )
Inertial Reduction is a decent travel power, but I decided not to get it as I'm not too fond of jumping.
From Elec I have
Charged Bolts ( 4 slotted IIRC )
Lightning Bolt ( 4 slotted IIRC , spammed )
Short Circuit ( 6 slotted , spammed )
Tesla Cage ( 6 slotted , spammed )
Thunderous Blast ( 6 slotted )
I would like to have Ball Lightning too, but I didn't want to sacrifice any of the other powers, Lightning bolt is too useful ).
I tried Zapp and wasn't impressed, the damage was good but the animation was too long in an already busy toon.
Voltaic Sentinel sounded like a really good idea, summon a pet so you don't have to blast. However the damage is pretty poor and I just end up forgetting about it.
Pool Pools
Hover ( 3 slotted for speed )
Hasten ( 3x RCG )
Super Speed ( 1xSPD )
Maneuvers ( 1xENDred, I normally don't have this on, I figured it was more useful than assault because I can get people to the damage cap anyway ).
Tactics ( 1xENDred, 3x ToHitBuff )
Swift
Health
Stamina ( 3 Slotted )
I decided to go for Super Speed as my travel power, even though I had the choice between IR, Fly and SS.
I have had every travel power at some point with this toon. This is my favourite version of the build, which I respecced into in the late 30s.
I did survive without stamina for most of my builds. However I prefer having it, for AVs and dangerous AoE enemies it means I play it safer and stay out of melee. I really missed the sleep resistance of Health too.
@Unthing ... Mostly on Union.
Ball Lightning is very useful after a Fulcrum shift. For PvE its a must. If you want to go down the end draining route slot Short Circuit with 2 accuracy, 2 recharge and 2 end mods. Then with Transferance and Transfusion you can disable just about anything. Has to be done quickly and then you have to keep them on 0 endurance.
If your in a full team with a few scrappers, wait for them to run in (and take the aggro) then Fulcrum Shift and use Ball Lightning. 
Hi, this is my first post but I have been looking at the forum for some time. I have got my toon to lvl 7 with siphon power, charged bolts, Transfusin, lightning bolt and siphon speed and im loving it so far. So i was wondering if you guys could give me some advice on any must have powers,which powers to slot and whether or not i need a travel power. thanks in advance