performance wise, the EK's the way to go
BUT the EK's have a messed up plating issue. so don't get the nickel get full copper version or the copper plexi version sans the EN plating.
The gold plated isn't worth it IMO. Could go with it but its actually brass and not gold :P
May also look at the Copper version of the Raystorm
thas what i'm getting.
What else dya have to work in conjunction with that block?
* if the cpu contact patch is the only thing thas plated, then get it other wise don't sway your head to an EN plated Ek block be it GPU or CPU.
** there are others like rubix has mentioned - take a look around