Anyone else think that nothing can really replace Redpower 2?
Now, even if you want to champion RP2 and consider it on par with the the other systems there's one part where they shine. The part that will always and forever be the Achilles' heel of RP2. All three sorting systems need power. AE can use EU and MJ. LP can use EU and MJ. RP2 requires RP2 power. I'll let my band of crickets explain how many other mods can effectively use RP2 power.
That leaves thermopiles.... without going into the math, just no.
In the meantime, using a redstone torch/repeater/dust (dust may behave oddly until builds as of last night) to bridge the block to the cable will work the way you want it to at the cost of making things one block bigger.