What SSD to buy?

If I could only choose from the 3 ssd's you listed, then I would choose the Plextor M5 Pro Extreme. Performance is very good and technical reviews were very favorable.

I normally recommend Samsung. The Samsung solid state drives perform extremely well and have a proven track record. Intel, Crucial, and Plextor are also worth considering. Lately the new SanDisk ssd's have been performing well.

I maintain the ssd database listed in a sticky at the very top of this forum section. Here is the link:

http://www.johnnylucky.org/data-storage/ssd-database.html

Scroll down to the brands and models you are interested in and follow the links to the technical reviews.