I love the B-1, but it's hard to deny the Blackjack. I remember seeing the XB-70 in Dayton. My dad and I just stood and stared at it. We walked all around it and ran our fingers over the landing gear. I recently heard a journalist got a ride in a B-2. Lucky bastard. I'd kill to ride in a B-52, let alone a Spirit.
The B-36 was a monster. I have the 1/72 Revel kit sitting on the shelves. Just waiting until I feel confident enough to tackle all the metal surfaces (and that damned canopy).
Of the old bombers I'd have to say that B-17 is my favorite, although the B-24 holds a place in my heart. We have a small airfield in the city I live in and a few years back a B-24 flew in. I wasn't around to see it, but I saw the pics. Bring a tear to your eye, seeing that old warhorse come lumbering in.