105F is probably a bit on the high side, although I've run gear at higher temperatures. The amp is probably the culprit, as it's going to generate heat that then rises through the components above it. Weight and cabling tend to make a low placement of the amp desirable, but heat ends up being

I hadn't looked at Cool Components before. They're use of "CFMs" in their venting and cooling notes drives me nuts. (It's sort of a pet peeve - "CFM" stands for "cubic feet per minute" unless you are specifically dealing with just one cubic foot, and is thus already plural. "CFMs" reads as "cubic feet per minutes" in my brain and makes my eye twitch. Same issue with "GPMs" or "RPMs"...)

Quiet fans are going to cost more than the typical fans (which are generally loud) but, as sluggo suggested, running them at lower than the design RPM will help even if you don't shell out for a really good fan. I'd focus any fan efforts on the amp, and make sure that you have a clear path for air intake and exhaust. Stirring the heat around won't really help. You'll need some way to get fresh air in and a way to remove the hot air.