Here's another option. It's also from OWC. I have one of these installed in my Mac Pro 5,1 with two 120 GB OWC 6 GB/sec SSDs. I also use a 120GB SSD for my Home folder, which is where all your personal data is stored (My Pictures, etc). I essentially use this SSD as the single location I work images from. (there are no Movies or Music on this Mac), but its primary use is as a digital audio WS. For data storage , I use an external device - it's an Intel 2500K with 16GB and five 2 TB Hitachi Ultrastars using RAID-Z in a mirrored striped configuration.
Bear in mind that when you are using SSDs instead of rotating disk for storage, the transfer protocol speed (SATA II vs SATA III, USB 2.0 v 3.0, etc) becomes much more significant. Using rotating drives, the actual transfer of data is about 15% of the overall transfer time, but with SSDs, it becomes a much larger percent, approaching 50% (depends on the speed of the flash memory in the drive now). Cutting 15% in half (by doubling transfer speed) gains ~7.5%, whereas cutting 40% (or greater) in half can speeds data service considerably more.
Another thing I did to improve performance on my Mac Pro was to upgrade the CPUs from 2.26 to 3.3 GHz (which is a lot easier than you may think), and install a striped RAID in the drive bays, consisting of four 300 GB WD Velociraptors.
While booting is not a benchmark, it does imply the speed of the the machine - mine boots in 18 seconds.
Hope this helps.