If you want to control ur panaflo, use speedfan, doesn't matter if you have RPM sensoring or not. I'm using Panaflo H1A in my SN45G and throttling it down with speedfan... I must say, though, it's cooler and quieter than the stock sunon. If you want to replace your fan, also look toward silenX, papst, and noiseblockers.
now I have to replace the stock fan on my Radeon 9600Pro, its the loudest thing in there... zm50-hp's fit... but its so hard to find here in canada

oh, and the new 250w silentX PSU is coming out this week, or next (supposedly a trade-in offer as well). cooler, quieter, and more power; great or what?