I was in the same situation over the summer. I love the T-buckets and have been going to shows for years and admiring them. This summer I seriously considered putting one together myself and looked into kits, but they are really expensive as kits. I was told by one of the guys as Total Performance that 15k (without the engine) will get you a complete car, but to make a really nice one is quite a bit more. The completed cars on their website are in the high 20's.
You can buy used for a lot cheaper. In fact, when it comes right down to it, I think it is much, much cooler to own a non-kit version of a t-bucket style hotrod. I finally decided that I'd rather have a non-kit car that has original parts, and it turned out to be a whole lot cheaper than I thought. Got it off of ebay from a guy in SanDiego and had it shipped cross-country
1928 model A pickup frame and body
1950 Ford 9" rear end
1940 Ford steering box
1937 chrysler headlights
'61 283 chevy small block
check out my pix