Best photo site to host photos?

I'm looking for a professional site to upload and host photos. It will be for a wedding I'm shooting. I just want to upload the photos and let them order them themselves, but I'm hoping for a good lab and a professional looking host.

I'm not interested in the shutterfly type hosts.

I've used the Moto photo site before and like it, but want something that looks a little more professional and that will keep the photos up for an extended period of time.

I'm willing to pay a small fee, but not one like the Pictage, etc sites charge since I'm doing this wedding almost for free.

Ay suggestions?? Thanks so much!