Oh, wow - there's a whole list in my mind!
First off, the Monogram 1/32 F-51D Mustang kit - not the Phantom Mustang, but the one with retractable landing gear, dropping bombs, and whatever else it could do. It was my very first kit - My dad came home from work one day and put 3 boxes on the kitchen table for me - the Mustang, a 1/48 Monogram P-40B, and I think it was an Aurora 17/72 Huey Cobra. We had no glue, so my dad mixed a batch of epoxy and we went to town that weekend. Sadly, they made me blue all the movable parts in place, since it was a model and not a toy. So I've been on the lookout, ever since I came back to the hobby (December), for one of these kits on eBay. (No luck yet, though.) This time I'm building it my way!
I also want another crack at the Hasegawa 1/32 kits of the 1930's US aircraft (P-12, F4B, BF2C, P-26) - I had pretty poor luck with them the first time around, as a teenager. I also want the Monogram 1/32 Grumman - the one that retracts the landing gear when you turn the propeller. That was always so tempting, but always out of my price range as a kid. I'd see it listed in that little brochure that Monogram included with all their kits, but it always had that super-out-of-range price (probably no more than $7.95, but with an allowance of maybe a buck a week back then, it might as well have been $100).