I am investigating getting the passive cooler (Coolmaster DP5-GN01) that Jake mentions, but having little luck so far...
Once I source the I plan to sell a couple of cooling kits for the SV24 shortly:
1> For passively cooled CPU setups
Rear case fan: Papst 612NGL (16dba)
PSU fan: Multicomp MCKD0504PEB3-8 (16dba)
CPU cooler: Coolmaster DP5-GN01 (noiseless!)
2> For SV's using the supplied low profile CPU cooler
Rear case fan & PSU fan as above.
CPU fan: Papst 612f (27dba)
If you want any more info, then mail me