I'll wait until the next generation SSD models arrive. While the better and more expensive SSD models have close to 30% over provisioning, eventually that provisioning will be consumed and the drive will start to lose capacity. Worse, as the capacity decreases the remaining good blocks will be hit ever more often.
How soon will the provisioning be consumed? It depends on how many disk writes are made and where they are made. But eventually it will happen and probably sooner than you think because Mac OS/X writes to the disk very, very frequently.