The TUKMC mod :
http://www.minecraftforum.net/topic/1702641-1467-tukmc-the-slickest-looking-hud-youll-see-for-a-while-updated/
It only changes part of the UI and gives information quite useful with FTB (biome, armor damages, fps, time, online players, etc.) without needing to go in the F3 menu...