It seems to be a shootout between the Thermalright AX-7, the Alpha 8045, the Swiftech 462 and the Thermaltake Volcano 7+
I think that you`d be happy with any of these and it depends on which you can easily get, they all have advantages disadvantages
AX-7 - hard to get in the UK, I`m still waiting for mine often seems to ship with the screamy Delta which is best removed and replaced with a more sane panaflo and there isn`t an option for P4 users - BUT seems to pip the others just to the post in cooling -fan-for-fan- and mounts using all three socket lugs, it`s excellent value too
Alpha - a pig to mount apparently, a few have killed their CPUs by doing it wrong and won`t fit boards without the holes around the socket but is up there with the AX7 and 462
Swiftech - Damn expensive and exclusive hole mount also but it`s a whisker between this and the AX-7 either way cooling wise, competition is good and I can see Swifty having to lower their prices
Volcano 7+ - Uses a 70MM fan which will be hard to replace when it packs up and fits using just the middle mounting lug (big mistake) BUT the price is superb, it`s in the running with the others and it comes with a speed control AND a fan as standard, it also comes with a P4 mounting kit which is so good that it makes you think that the Athlon support was an afterthought..
I went for the AX-7 as the combination of price, lack of supplied fan on UK models (we ALL have loadsa 80mm fans abpout don`t we ;-) and performance though i AM still waiting for it after 2 weeks..