I've been recommended Collinite 476 as a good, durable carnuba-based wax - a friend used it after detailing my NSX and it seemed to last a decent amount of time. I use their easier-to-deal-with 845 with fair results, but I'm an amateur at this...
I've also been told Meguiars NXT is a good detergent for use in hard-water areas, possibly a little agressive on waxes (unless you dose precisely) with soft water.
Finally, the snow-foams are mainly if you've a very dirty car that NEEDS a pre-wash to loosen up the crud. Otherwise just keep it waxed and hose-off with a jet-wash on a low-ish pressure...