A really good source for paint if you live in Europe is Zero from Hiroboy, he can mix just about any colour you want if you provide the paint number, make, year and colour name.
Otherwise, as already stated Tamiya spraycans is the way to go. If you wan't a really gloss surface you need to clear coat both the silver leaf and the aluminium colours.
A couple of examples:
56 Nomad painted with silver leaf and clear coated, it loses some of it's brightness but the paint job gets more durable.
Before cleat coat
...and after.
...and then I've used aluminium with no clear coat on this Xanavi Nismo.
Good luck and keep us posted on the progress.
Niclas