Once you go SSD you won't look back.
I upgraded my old laptop to SSD - it's only SATA2 (3gb/sec) but it's screaming fast. Best performance upgrade possible.
Additionally, my desktop has two 128 gb SSD's in a RAID0 for 256 gb w/ SATA3 at 6gb/sec. I had that running comfortably for well over a year until my power supply fried my motherboard.
Upgraded to a better power supply, newer motherboard and re-installed win7 64bit after upgrading the firmware on the SSD's (Crucial). Also upgraded my storage hard disk to a hybrid with a SSD cache. System is fast.
-SDF