I love the Nikon 70-200mm F2.8 AFS-VR G lens. At first I didn't like it all that much but using it with the D200 has really made as huge difference over using it with the D70 and D70S I had. I hope to see equally good results with the D300 body but time will tell. I tend to like to stand back and sweep the turns for any "excitement" so the 70-200mm is my mainstay lens.
In the medium range I have a Nikon 28-70mm F2.8 AFS that absolutely sucked on the D70 and D70S but was pretty sharp on a D200. Haven't tried it on the D300 yet.
I also have a Tamron 28-75mm F2.8 XR-DI Lens that has proven to be less than stellar at focusing and locking on anything moving. It's 1/4 the price of the Nikon 28-70 lens I have and has done great in victory lane but for on track shots, not so much.
I have a Sigma 70-200 MM F2.8 lens that is pretty nice and OK for the price but nowhere in the same ballpark as the Nikon AFS-VR G Lens. It produces nice images but just not as consistently or as sharp as the Nikon. Again, there is a trade off since it is 1/3 the price of the Nikon but the Nikon as three or four times the warranty length too. Rich Kepner (BRKRacing here on the board) has the same lens and may be able to offer some opinions based upon his weekly experience with it.
I have a Nikon 24mm F2.8 prime lens I have been using just for mall shows and indoor shows. I need something much wider in this lens range in order to pull off the shots I want. Still saving my pennies for this quest.
Somewhere in a box I have a Tomron 28-300mm F3.5-6.3 telescoping lens that I used to use with a Nikon 8008s film camera. I've never tried that on a digital body but I don't think it would be anything I would take to a track.Flashes/Flashi ?:
Lumedyne P4LX 400 ws power pack with standard head (broken), Large size battery (broken), 54Z Super Speed Module (Broken), Norman 8" reflector head. This was (is) the very best of the best that Lumedyne offers but after standing in the off and on (mostly on) rain at Eldora's USAC Four Crown in 2006 for 21 hours it gave up the ghost and Lumedyne in their infinite wisdom has stopped making standard heads in favour of modeling heads which do me no good at the track. So now I have an $2100 flash system with no reason to have it fixed because they no longer sell a $250 standard head that would make it useable at a track.
I will be moving to a Norman 400B power pack and standard head at the end of March (see Lumedyne diatribe above). Norman still understands that not everyone is a wedding photographer or working for Penthouse !
Nikon SB800 - I use this for indoor races and mall race shows and for victory lane. It's a very versatile flash. I just wish Nikon made something I can use for the on track shots (big time artificial sun !)
Sunpak 622 handle flash with super Zoom Head. - I have a couple of these and have probably had five of these over the last ten years. They are real workhorses and pretty cheap compared to other flashes ($250 for the flash and head) but they are not real good to get caught in the rain with. The head has no weather seals and is very susceptible to both dust and moisture. On the plus side, they do emit a really cool mushroom cloud of smoke when they burn up !