as far as i know, the only advantage an fx processor has on a regular amd processor is the unlocked multiplier.. only an advantage if you overclock...(and of course the fx is usually fastest in the line).
most people here are AMD fans, but they recommend intel anyways because the new benchmarks that came out for the new intel processors are astounding... much faster than AMD. AMD retaliated with cutting their chip prices... i think AMD played it very well, because most people are going for hte low priced dual cores rather than the conroes...
as for 65nm amd chips.. i heard later this year or early next year... heck.. it could even be later next year.. get a 4600+ processor for now, and upgrade it later with the money that you'll save... you'll probably get a better AMD processor thats a lot cheaper than the fx62
oh, and as far as i know, the 4400+ and the 4800+ are not available for socket AM2... only chip with the bigger cache is the 4000+ which, as it seems, hasn't been affected by the price cuts..
4600+ is great value now i reckon.
"Is virtue a thing remote? I wish to be virtuous, and lo! Virtue is at hand." -Confucius