I use a-m0d which is a 1.8 version of Latemod with a few crappy tools come with it. But it is the best I can get. Sometimes I use Metro too
Well you could just look at wizardhax or leak forums there's plenty there including am0d version 17 as @Starfletcher stated above but it all depends on what you use the client for pvp you would be best of with either energy leaked one or am0d version 17 also the leaked version. Building and mining I would probably choose metro, it's all down to which client suits you best.