1. What model is your favourite ?
2. As wardlaw said : What's the final plan for the bike ?
Choice your preffered model ( 18, 21 or 28 ), and then think what you want for your bike. If you're going to use her as a track bike, you can look for a less "minty" bike, less "standard" ( with aftermarket exhaust, HRC jet kit or anything else for example ). If you want a original resto, you must look for a unmodified one, and if you want a showroom original, then one minty bike it's the way to go.
I personally prefer the 21's, then 18's and finally 28's, but that doesn't mean my choice is the perfect choice for you, it's a matter of what you like, and once you know what you want, think what use you will give to her.
