You should also consider getting more RAM or making a RAID0 array to give you more performance as well. SSD's are quite expensive at the moment, so a RAM upgrade/RAID config will give you a performance boost for cheap.
I would never recommend RAID0. Yes it does improve performance, but it also doubles your chances of a disk failure,
and if you lose one drive in the array, you have just lost ALL the data on the array!
The risks are just not worth it to me.