I would avoid SSD's that are available today. Excepting the new offerings from Intel. They are priced at $600 which is too much for me.
You might want to read this anandtech article on ssd http://en.wikipedia.org/wiki/Solid-state_drive
The conclusion is that JMicron JMF602 based MLC SSD's are unacceptable because of random write issues.
I love my velociraptor. It DOES make a difference. If you want the best today, and don't mind the price, get it.