I'm of the same mind as Rob - I've built the Monogram P-40 twice (that I can remember - maybe a third as well) and I have another unbuilt kit. It was one of the first 3 kits I ever had, and I keep going back to it - I guess trying to recapture a little of my youth. My dad came home from work one day and put 3 boxes on the table - the Monogram 1/48 P-40, the Monogram 1/32 P-51D, and the Aurora (I think) 1/72 Huey Cobra. I forget if there was a specific occasion for this or not. He got them at Two Guys in Newark on his lunch break. (Anyone remember that store?) I built all of them without any paint and LOTS of glue - didn't have any model cement so my father mixed up some epoxy. NEVER USE EPOXY FOR MODELS!!! Anyway, we built them and slapped the decals on - didn't know how to do decals either, so we left them in the water until they slid off the paper. If I only knew then...
That was around 1967 (guesstimate) - then around 1986 or so (still little to no building skills) I got another Monogram P-40 and decided that for variation's sake I'd build it as a British version. So for some reason I gave it a brown-and-tan camouflage scheme on top and duck-egg blue underneath. And I painted the nose red, white and blue (3 different parts - the spinner and two separate nose pieces - made that almost mistake-free). Never got to the decal stage, though. I just found it gathering dust in the attic and brought it out - the wing assembly is close to falling off, since it was always a poor fit and I didn't do putty or CA yet when I built it. So I'm duty-bound to get it right the third time. No idea yet, how I'm going to attack it this time, though. LOTS of patience at the very least. And I've been scouring eBay for another 1/32 P-51D so I can do that one right.
And then there's the stash.....at least 4 TBD Devastator kits - 2 1/72 Airfix and 2 1/48 Monogram. I'm not sure if I heard a rumor somewhere (here?) about a 1/32 Devastator kit due to release soon, but I'm all over it if it is true! Somewhere down the line the Devastator became my favorite aircraft. My fantasy sports teams are all named the Devastators (prophetically, they all seem to crash & burn too) - and I just plain fell in love with the aircraft, for some reason. To the extent that I'm afraid to try and build any so far, for fear that I'll screw up and not do it justice.