If you want to stay in 1:25 scale:
The 100th anniversary kit, is the '60s tooling Bel Air. It's a good kit, and I like it a lot but it's not as detailed as the newer tool kits. I built it and loved it, but for some, the detail level is not enough.
There is a newer version of the '57 Chevy, also by AMT, with more detail and opening trunk. It's a kit of the same level of detail as the AMT '20 Catalina, '58 Edsel, or '58 Plymouth. newer tool, like I said.
The Revell kit is not a Hardtop, like the Monogram 1:12 and the AMT kits, it's a two door sedan (with post), and it's also a new tool kit, with great detail.