I've wanted to go with an 18" front wheel for a few reasons. One is to get it more inline with old school road bikes rather than cruisers. Another is to drop the front another half inch. And third is to match more closely the rim Ryca uses in the kit.
I originally assumed I'd get the rim from Buchanan Spoke & Rim, but I got poking around on the net and found a guy with the rim I want for significantly less that Buchanan -- and he had it in stock.
18" x 2.15 WM3 shouldered, dimpled, polished, aluminum.And then I learned about Woody's Wheel Works, who uses Buchanan spokes but will lace and true the wheel for less.