biggest thing to look for is ocz/patriot/corsair drives with 200+ Mb/s reads, and intel G2 drives that are around 250Mb/s read. kingston drives are intel-based in some but not all cases, their slower drives are samsung units and might not ever get trim, their faster drives (170Mb/s or faster read I believe) are intel units and will probably end up with trim.
drives to avoid: g1 intel drives, slower drives of any stripe