Here you go:
20" Monitors (Sides):
Dell 2001fp (S-IPS)
Dell 2007fp (S-IPS or S-PVA) [If you get an IPS 30 get and IPS 20 and vice versa as there is a panel lottery with this model]
HP 2035 (IPS)
HP LP2065 (IPS)
Samsung 204B (TN)
Samsung 204T (S-PVA)
Samsung 214T (S-PVA [21.5"]) (Don't Recommend) [A bit too big]
NOTE: The Dell 2007wfp is not the same as the 200fp. The wfp is a widescreen monitor.
nVidia Surround will not work with this. PLP is still limited to SoftTH and Windowed Mode. I don't see that changing in the foreseeable future.