If you're serious about a build, I am likely parting out my 2004 (66k miles) that I started prepping for BSP, though I could be talked into selling it as a whole before doing so. Located in Half Moon Bay, CAhttp://www.project350z.com
for more info on the car.
List of mods at http://www.project350z.com
/Articles/itemId/534/Autocross-350z-Modifications-List.aspx (stereo/speakers are back in right now, easy to pull)
I currently fit 305s all the way around, plan was to go to 315s, fronts right now have a 10mm spacer (I think that's the size) to fit, 315s might require a bit more, haven't had any fender issues. As is the car can carry all 4 tires, jack, tools, to/from a local autocross, I didn't around to getting a trailer to tow (hitch installed though).
I weighed the car back in February, car was at 3062lbs, since then I have put the stereo back in, mounted a trailer hitch on the back, and replaced some leaky exhaust, probably has gone up a few pounds, but in SP trim could definitely come down quite a bit more.
The only reason I am considering it is that I simply don't have the budget for 2012 to finish the build (differential, seats, brakes) and compete, I have to take a year or two off, spend time working and with the family, then get back into things.