Well after doing some more searching I've decided on the Raynox DCR-720. They're up on eBay for $50.00 with free shipping. It appears a bit less angle than the 730 but $20.00 cheaper and it should work for my needs. It also appears the 720 has threads for a cap but the 730 no longer has them

I know the 6600 is probably the best but all I'm looking for is one to give me a little wider angle so I can fit a few more people into the family shots.