Purchasing 7D - please help with lenses!!!!

[neuroanatomist]

IMO, the best general purpose zoom for an APS-C body like the 7D is the 17-55mm f/2.8 IS, followed by the 15-85mm f/3.5-5.6 IS. Both deliver L-series optical quality, although the build is not up to L standards. The 24-105mm f/4L IS is a decent outdoor lens on the 7D, but optically a little worse than the 17-55mm, despite being an L-series lens. However, the 7D + 24-105mm gives you a weather-sealed combination. Then again...you're going to SE Asia in the dry season, when rain is pretty unlikely.

I like the combination of the17-55mm f/2.8 with a 70-200mm L-series zoom, the f/4L IS if weight is a concern (likely for travel), else the f/2.8L IS II which gives you f/2.8 from 17-200mm. The 50mm f/1.4 is a good addition, but you might also consider the 35mm f/1.4L which would deliver a more 'normal' focal length on APS-C.

There are two 'common' zoom combinations, the fast and the slow, for APS-C:

Fast: EF-S 17-55mm f/2.8 IS, EF 70-200mm f/2.8L IS II
Slow: EF-S 15-85mm f/3.5-5.6 IS, EF 70-300mm f/4-5.6L IS

Personally, I prefer f/2.8 zooms, especially on the 7D where you have less flexibility on pushing the ISO up high.

You don't mention a budget, except to say 'regardless of price'. If I was building a versatile travel kit around a 7D, I'd have an EF-S 10-22mm f/3.5-4.5 (or possibly the Sigma 8-16mm), EF-S 17-55mm f/2.8 IS, and 70-200mm f/2.8L IS II, possibly a 1.4x TC just in case, along with a 430EX II and a good, carbon fiber tripod. Don't worry about the overlap between the 10-22mm and the 17-55mm - the ultrawide 10-22mm is a special purpose lens.

One other consideration, if money really isn't an object. You mention photographing buildings, and for that there's almost no better lens than a TS-E. A standard lens will give you substantial perspective distortion because you have to point it up toward the building, a TS-E lens corrects for that with shift. I use my TS-E 24mm f/3.5L II on a 5DII for architectural photography; on a 7D it would be too narrow, and I'd recommend the TS-E 17mm f/4L instead.