For an OS SSD, the intel used to be the only drive to consider. That may be changing. Do not focus on the read transfer rates, that is relatively unimportant for an OS drive. The OS does lots of small reads and writes. For reads, you will do well with almost any drive, primarily because of the minimal access time. Look an the write capability. If the drive does not have a good controller, you may encounter write delays in the tens of seconds when the drive is hit with lots of writes; that is most disturbing. If you have windows-7 you get trim support, so any drive with trim such as the X25-m G2 will be very good(intel currently is redoing the trim microcode on this). Otherwise, the X25-M G1 works well.
This arena is changing very fast, so a wait of a few months might get you a much better and cheaper drive.