My Recommendations:
Samsung 830 or 840 Pro (not plain jane 840)
Curcial M4, Plextor M3/M5 - No to Curcial M5
Note: Intel 520 is great for reliability, But not a lover of the Sandforce 22xx Controller.
Currently have:
3 Crucial M4s
3 Samsung 830's
2 Agility IIIs - Ugh
Just ordered the Samsung 840 pro.
Performance wise, Very little Real Life, Day-2-Day difference so My recommendations are based more on Reliability/least User problems.