ok lets clear some things up here.
1) yes SSDs are fast but for the price/size they arent worth it for almost all ppl
2)you wont gain much performance from using one unless your using a rig with less than 1 maybe 1.5 gb of ram.
3)since they are rather small (i think the largest is 160gb) they arent that good if you have tons (and i mean TONS) of stuff you'll be putting on it.
4)SSDs' are still "new" tech and are not completely mainstream yet. the ones who are buying these are extreme system builders, overclockers, and bench markers.
5)they're not like HHDs were you can just defrag them as it will mess up the files you have on them.
so a fore warning to those considering buying one of these, if your looking to improve your system your better off buying a good gpu/cpu/mobo/more ram and leaving the uneeded stuff in the store.
(just my 2 cents)
EDIT: also most motherboards top out around 8gb of ram (which is ALOT) and you dont need the most pricy stuff out there, some 800mhz ram will do nicely and only cost about $100 for 4gbs worth