From reading CM's writeup on the 212X, I'd say don't bother waiting. It seems it's the same deal with the EVO over the Plus - just a different cooling fan (plus a few features that don't seem terribly important).
Looking at FrostyTech's latest charts
, it appears as though the 212 EVO is the better heatsink, being both quieter and cooler (its lead is even more exacerbated in the AMD charts). This is just one review, though, so take it as you will.Edit:
Good catch from Timmy - the Dark Knight is an excellent choice right now (it's also on FT's charts - very close to the top, with only 4 air coolers above it).