Right now I'm using a Nikon D300 body coupled with a Sigma 70-200mm f2.8 APO DG EX HSM lens, a Nikon 18-55mm f3.5-5.6 "kit lens", a Nikon 50mm f1.8D that I never use unless it's almost black outside, and a borrowed Tokina 11-16mm f2.8 lens I'm trying out as a super wide-angle solution for a low-angle motion rig I'm building. That seems to be one of the shots editors prefer, so I'm going to give it my own "low light" special twist.
I don't like filters. I try not to use them at all. Photos taken without them appear sharper and less-clouded to my eyes. I do have a UV0 filter on either my kit lens or the 50mm, and I've got a regular polarizer which really screws up the metering (I have to compensate manually, which is actually quite easy, just take the polarizer off and meter, then put it on a meter, then adjust and shoot!). A regular polarizer if much cheaper than a circular one, in case you're wondering. This method works, and is extremely cost effective, since I found the filter used on a clearance table at Tempe Camera in Phoenix, Arizona a few years ago. I've got another 72mm polarizer I use on the Sigma lens occasionally. Shooting at the right time of day (evening) helps to minimize the need to use a polarizer though. I don't use any neutral density filters. I think I should buy a few and try them on the low-angle rig though, so I can slow down the shutter speeds to the needed range during brighter periods of the evening.
more to come later...