SSD's vs USB flash drives uses wear leveling algorithms.
Been using my Samsung 64 GB SSD for almost 18 months now with no problems. In use 12+ hours a day and I regularly copy and delete large files. It's my primary drive with Windows XP and all my applications installed on it. Pair it with a hard drive for data.
Just had a quick look at the Frontosa price list and a 64 GB Corsair is around R3000 incl VAT retail. 170 MB/s read and 100 MB/s write.
Next time your PC slows down, note the hard drive LED is flashing away ... imagine that bottleneck gone ...
Highly recommended.