A few notes on SSD drives. The failure rate on newer drives is lower then a standard HD(this was not the case a few years ago) They are actually twice the size of their rated capacity and these blocks are used to replace seamlessly the blocks that can no longer be written to as they have been written too many times. Failure to write was the problem with the older drives but you could still read the data. They're rated at 5-10 years at this point which from experience I can tell you is much longer than most hard drives.
Also consider if you get an SSD consider that since sata2 maxes out at 300Megs a second if you get something like a OCZ vertex 3 drive you can easily hit the 500 Megs a second mark which means you're not getting the performance it's capable of. Sata3 maxes out at 600.
You can check out last years performance charts for SSDs here. http://www.tomshardware.com/charts/ssd- ... s,110.html
I know it might seem like you're saving a little money now but in 12 months you'll be thankful if you spend the extra money. But of course that can depend on your usage. I do 3d rendering and video editing so I need all the power I can get.
If you are going to go with a sata2 setup then an OCD vertex 2 or corsair force series will give you 270-290 megs a second which is still freakishly fast.