For many years I used a Nikon N90s, and did it the same way- a 50mm on the camera, a 135mm in one pocket and the 28mm in the other. Don't really like zooms. Since a midnight visitor invaded the boat and stole my small but nice Olympus digital, I may buy a DSLR--a Canon EOS 5D is the latest candidate, (prices have dropped to 1500 Euros) mostly for the sensor size. Dunno. Also, the new EOS 350 is a candidate. Capitalism searches out the darkest corners of human potential, and mainlines them.
Zooms make me lazy, especially at the wide to short telephoto range. I'd much rather use 20mm, 50mm and 85mm primes with a single long zoom than have just two zooms. Currently I have the Sigma EX 10-20mm to give me wide-angle on the D70s (effectively 15-30mm) but I don't enjoy it. Maybe if I tape up the zoom ring so it is effectively a fixed 20mm equiv ...
I still find it hard to go out with only ones lens and hate having to change too often so it does discipline me into roughly planning the shots I want to get. Ad astra per aspera
After the D3, Canon might bring out an interesting model ? It might be worth it to wait a bit that the dust settles ? "What can I do, What can I write, Against the fall of Night". A.E. Housman