I had 2x Vertex 30GB in Raid0, now I have one left and preperring myself to buy Vertex 2E 60GB.
After having them in Raid config and single drives I can say that there was a little speedup having raid, but one drive is enough for SATA2.
I have few PCs and only my gaming rig has SSD and I have to admit every time I'm going to do something on other PC I cannot believe how slow they are! You sit there, staring at the monitor, HDD led is going crazy, cursor changes to sandglass... time is passing by...
Seriously, after you try SSD there is no turning back!
Perfect solution for me is 60GB for OS and soft + some slowly loading games.
Rest of the stuff can be kept on small HDD.
Me for example, perfect solution is SSD + 2.5" HDD 7200rpm. I have Scorpio Black 320GB for games and other stuff, SSD has OS, soft, games.
Both drives take very small space in my build, are silent and cool. I will NEVER go back to regular 3.5" drive. Same as regular ATX case
SSD + SFF F T W !!!
