Waiting for announcements from now until Photokina in September seems wise, unless you are in a hurry.
On one hand, Olympus has been giving strong signs of replacing the E-1 with a new top of the line model (the E-3?): E-1's are being heavily discounted lately, which looks like clearing out stocks after ending production, and Olympus has put out numerous hints of a new high end model coming soon, and at least one reputable professional E-1 user has talked of testing a prototype of a new body. The 14-35 f/2 might at last appear too.
On the other hand, other companies are likely to have new offerings at the advanced amateur to professional level. The expected 1DsMkII replacement may be out of your price range, but I hereby speculate that Canon will take the EF-S system to at least 10MP (35D?), Nikon will replace the D70s with a body using the same 10MP sensor as in the Sony A100, and the coming Pentax 10MP body might be a good price/performance option too.
P. S. I doubt you share Ray's view that only Canon can make good DSLR sensors; I for one expect that between Panasonic nMOS, Kodak FF CCD, the CMOS sensors that Kodak is apparently developing, and other options like 4/3 consortium sleeper Fuji, Olympus will be able to offer good sensors. And if you can afford the Zuiko f/2 zooms, you could often half the ISO speed compared to f/2.8 zooms with DX, EF-S, etc. Even the f/2.8-3.5 zooms (including the coming Panasonic/Leica with OIS) allow using 1/2 to 1 stop lower ISO speed than comparably priced lenses for "APS-C" formats.