Help choosing HSF for XP2800+

[Guardian]

Hey guys, any suggestions for a replacement HSF for an XP2800+ on an Asus A7N8X-E Deluxe? Currently runs 49 C idle with retail stock HSF. I would like to get the temp down so I can start oc'ing a little. Noise level is not really a factor. Any suggestions greatly appreciated.
Asus A7N8X-E Deluxe
AMD Athlon XP2800+
512Mb Corsair TwinX PC3200c2
Seagate Barracuda V 80Gb Sata w/ 8mb cache
Radeon 9800Pro
Aspire X-Pider case w/ two case fans, 420 ps w/ 2fans

 

[scottchen]

Thermalright SLK947U, if noise isn't an issue, then 92mm Tornado.

-Intel PIV 2.6C @ 3.276G -Asus P4P800 -OCZ Copper 4x256 4000EL memory @ 252mhz 2.5-3-4-6 -XFX 5900 128meg 570/1040 -SB audigy -2x120G Seagate 7200.7 S-ATA150 hdd -450 Enermax PSU