we too have been on the litter hunt as well and have yet to find the perfect litter.
So far the best for odor control (and we have tried practically everything you fab members have suggested except the pine stuff which we cannot find) seems to be Special Kitty (non clumping). It's a weird litter though in that it is made of silica beads that look like teeny balls the size of barley except that they are clear. When the silica beads are too "used" they change colour.
The only downside is that they bounce and sometimes you can hear us stepping on them. It doesn't "track" as much as some of the other litters but it does track a bit. We found it at wall mart in Canada.
This is by far the best odor reducing litter we have tried. We have 2 cats that use the same litterbox without issues.