I love these threads. Assuming that I can stretch the definition of "bulk" to 8oz bags/boxes:
2 x 8oz bag Samuel Gawith Squadron Leader
1lb Peter Stokkebye Cube Cut
1lb Sutliff Balkan Sobranie Match
1lb Sutliff Victorian (Elizabethan Match)
1lb Newminster #400 Superior Navy Flake
That's $237 at current prices in my SmokingPipes cart. This list gets me a tasty but not overwhelming English, a sweetened easy-going Burley/Virginia, a well-regarded Balkan (I've never had the original Balkan Sobranie), and a tasty VaPer. I actually haven't tried the Newmarket #400 yet, but I'd want a straight Virginia flake of some kind if I were starting over from scratch and were limited to bulks that were easy to get. I could be very happy with that rotation, and at the rate I smoke, 5 lbs would go a long ways...
With the remaining $13, I would then throw in a tin of C&D Visions of Celephaïs or War Horse Bar. Sometimes I just get the itch for something with funky flavors yet can still kick my ass.