Martin: Very nice image!!
The problem is that a zoom lens won't be as fast as a prime for the same price. You can get a 70-200 F2.8L II lens but is very expensive.
I'd consider:
The 100mm F2 lens is really cheap and underrated, if you don't shoot macro the F2 aperture at 100mm really works nice for astro.
The 200mm F2.8 L II prime is also cheap and has excellent IQ.
I think 100mm is kind of large for the Milky Way but I'm not sure what kind of MW shots you like to do, to get a good span of the MW I'm using focals from 14 to 28mm on my 5DII.
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