Thanks Guys!
It's a 4 year old machine, I wasn't willing to invest any real money... I keep running into the not enough space for start up disk... I just wanted to update the HD for the laptop I use when I'm out in the woods taking pictures/back-up machine. I keep moving pictures off of it, but I only have about 4-6 gigs available at any time. I'm not doing the upgrade for the speed increase necessarily, I was just curious.
It's not worth my putting in a 500 gig SSD for $300 - $400... I'm going to get the 13" Retina here over the Holidays, but I wanted this MBP to still be useable.
Thanks for all the comments.
Coachingguy