*cough* Resonant Rise *cough cough*
Oh wait that's not out yet.
Uhm. Yeah, Ultimate's probably the best to use if you want ALL TEH MODS!
Otherwise, I'd probably go DW20. It's what I used before AdvancingCraft! I mean, there's no GregTech (and GregTech is awesome!), but you can add that in pretty trivially.