Ahem, normally I'm the first to admit that the search function on these forums is a bit rubbish, and tend to expect certain topics to be frequently repeated over the space of the months.
However, on the front page of the Blaster Forums in the first ten threads at the moment, in addition to this one, we have:
1. Elec/ and End Modification;
2. Elec/Elec/Elec build - sugggestions please (Also containing links to several other recent similar discussion);
3. Short circuit;
4. Power sink.
I think one of those could probably give you at least some of the information you are looking for. 
I'm sure if you have additional questions someone will be happy to help you, most people in here tend to be.
Appologies, PC is acting realy wierd on the internet sorry, so didn't bother to check the rest of the forum 
Hey all, i've been trying to come up for a decent blaster, and decided on a Elec/Elec. It isn't for PvP or anything it's just for PvE and Soloing probably, i've being trying to knock up a few builds my self, but can't seem to get the power choices right, i'm just wondering what works best from Elec/Elec.
Thanks in advance all