hey aa0,
i'd recommend, just replacing ur current hsf, rather than buying a 60-80mm adapter, as they tend to not work that well, and cost too much. u can get the svc gc68 get it shipped for under $20 from
case-mod.com, or if ur willing to spend a little more, u can get the alpha pal8045 for $30 + shipping, tho this doesn't come with a fan.
in terms of value, u can't beat the gc68, as it's a pretty decent and quiet performer for very little money.
hope this helps.
lordbob99