The most recent Revell F1 Kits are excellent for the money (Toyota TF102 up to the most recent). The scale may be odd for an f1 kit, but they are pretty good. They include very nice cartograf decals and capture the cars shape very well. You can see a built up example of Revells F2003 at
www.cifesystem.com I also have a built up example of the F2003 on the link in my signature.