With regards to GT and nuclear, the ComputerCube and all the 2nd tier reactor stuff is all broken since IC2 went Experimental. Basically, just the regular IC2 nuclear stuff is valid right now. Any standard Mark 1 should be just fine. IC2 Exp also added the RTG reactor, which is a non-consuming reactor using spent fuels. Generates 1-16EU/t iirc. Afraid I don't have a link for it, but DW20 did some a few seasons ago in his Server play. (and I'm not at home to load up my last world to recall how it all works). Oh and make sure you Always wear your Hazmat suit and scuba mask and rubber boots while handling processed Uranium. Otherwise you will die. Quickly.
Has anyone done a cost / benefit analysis for Steam Boilers to Commercial Steam Engines vs Steam Dynamos?
If you're powering your base I can see where having a base RF infrastructure works, but if you want to Tesseract power to quarries, guess you have to start with RF.