Should i get one? Should I get the Sandisk?
Do you think it will be a big improvement over my dinky laptop drive that I had to reformat and repair?
I highly recommend that you buy a SSD to replace that refurbished laptop drive!
If you re-install your OS onto the SSD you will get the extra benifit of high responsiveness and boot speeds, whilst games that stream in textures or levels will have less stuttering then if you were using that hard drive. However if you install games that pre-load all the textures such as Dead Space, you will simply be wasting space on it for a few seconds less loading.
I recommend that you buy the SSD and re-install your OS onto it along with the games you play most frequently, and use your hard drive for media and other games.
P.S. I own a SSD myself, just a small 60Gb one that I picked up a year ago and I regret nothing. Windows is VASTLY more responsive now then with my previous Hard Drive.