I'm a sucker for the Armour 1/48th P38 Lightnings. The quality of work on those diecast 38s is remarkable. Just ordered my 7th.
So far 2 80th Headhunters (Jay Robbins and Cy Homer), 2 475th FG birds(Tommy McGuire's and "Andy" Andersons), a 49th FG 38(George Laven) and a 20th FG bird(Bob Meyers)
370th FG 9th AF 38 otw.
Lots of good stuff out there too. Some not that expensive although there are some that are also way up there.
These P51Bs in 1/48th look really nice, but kinda pricey
http://www.onmarkint.com/eagles/