I've had similar experience and improvements with a 200V.
Bungee mounted the hdd after binning the removable hdd rack - made an enormous difference. Also cut out the fan grills on both the rear case exhaust and the psu intake fan. The CPU and case fans on the 200V are both 60mm: haven't done anything to them (and the psu is 70mm). In essence this thing is vitually silent (using speedfan) at idle and browsing/editing. While folding I run the fans about 2000rpm which is far from silent (XP2500 CPU temp max 47C) but only temporary: in its permanent home it will not be folding
But have to say I think the iDeq internals/wiring/airflow/cooling etc are the best SFF I have seen. The only thing that would be better would be a Shuttle Zen (external psu) that takes Athlon 64!