The Samsung 830 256GB units are going for around $210 right now. You can find better deals if you look around, I believe there was a place selling them for $180 a couple weeks ago.
Personally, I just picked up a 256GB Crucial M4 for my mid-2009 MBP. It works great, although the drive is limited by my SATA II interface(which I believe you would be as well.)