I've always been quite drawn to the B-29 - I remember being so pleased to get a first - rather brief - glimpse of Hawg Wild at Duxford while driving past in a coach in 1980! Better still seeing Fifi flying at Midland 20 years later.
Incidentally, I was amazed to realise recently that I've seen all five B-29s that have flown under civil registrations - apart from the two above, a rather tatty Doc at Inyokern just after she was dragged out of China Lake, Tallichet's B-29 which is now preserved at March AFB, and the forward fuselage of Kermit's Fertile Myrtle at Tamiami - don't think the rest of it was there, if it was it was well hidden! Kee Bird doesn't count as it didn't fly!
I do like the B-17 as well...