[PNJSNAK]

Pick up the latest issue of Kit Car Builder Feb 2010. It has the Cobra Guide 2010 which is a listing of different manufacturers with their websites.
London has just about all the different makes show up. It is great to see 300 cars with different color combinations, tires, wheels, stripes, no stripes and engines. It is kind of dominated with FFR and Superformance. But maybe that is the way you might be leaning and there will be many examples of those there.
The big decisions will be your budget and whether you want to get a turnkey, turnkey minus or build it yourself. Once you have that decision made then you can start weeding out certain makes.
Good luck and enjoy the ride!