I don't have any of the SH Figuarts Kamen Riders yet (I do collect the SIC Riders, though) but I'm thinking that this might be a good place to start.
This is the Cyclone motorcycle for your Kamen Rider 1 (Ichigo) figure. (Of course, I'd have to get one of those figures to go with the bike, too.) But KR 1 on the Cyclone is just a classic. It's what started it all way back in 1971!
It will be released in August for Y4,200 (approx $42.00)