Gigatron
Wow - thanks for all the replies, guys
Gee, Gig, what did you expect? After all, this is the home of the Monogram Maf-, er, uh, I mean, the Monogram Legitimate Businessmen's Club Just teasing, of course. It's a good question!
Surprised that Hammer hasn't posted yet (I don't think I missed it).
From me, I'll say the PV-1, and then go right to the classic kits that were developed by Monogram. My picks are:
the large bombers and transports: the B-17G, the B-24J and -D, the B-29, the C-47, and in 1/72, the B-36 and B-52
the B-25, B-26, and the P-61, acknowledging that many find fit issues with the latter
the TBD, the P-39, the P-51D and P-47D, both the razorback and bubbletop
the P-40B and the P-51B, even though they do show their age
the P-38, the Typhoon, the Fw-190
the F-80 and F-86
in 1/72, the old F4B-4, the F11C, the P-6, the P-40N and P-51B
Now, some will be able to find issues with any one of these kits, fit issues and such, but I think that every one of these is a good kit, which can be built into a decent representation of the real thing, with not too much effort. and into really great models, if you'd like to try your hand at superdetailing.
The older 1/48 kits, like the USN birds, the Me-109 and Zero, are fun to build, and also can provide the same satisfaction and opportunity to superdetail, but even I concede that there are newer kits of those subjects that are probably better to build for the builder who doesn't have the skill or the inclination to go nuts with a kit.