Lava remains, in my opinion, the easiest start, and has the advantage of being useful for RF/MJ and EU. 30 minutes mining (YMMV) and you should have plenty of resources for a Magma Dynamo, Pulverizer, Redstone Furnace, and some cans for lava. After that, you have a fair number of choices for mid/late game energy. I still like steam, but the barrier for entry is considerably higher than it was in 1.5. To be fair, once you get to the Nether (or a Mystcraft lava ocean), lava is viable for a long time, now that Dynamos are 80RF/t, so if building complex/interesting power generation isn't your thing, you can just keep spamming Dynamos.