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Sorry Houghy, just stumbled onto this thread.
I have always liked primes, but the practicalities of the zoom sent me that way.
I have the 20D, and bought the 17-40 f4L series, and the 70-200 f4L series, both from an online dealer in Ozzie. They are superb. Yes, Canon make f2.8 equivilents, but they come at a cost, both to the wallet, and the back. They are bigger, heavier, and more expensive.
I might add that I use them about 50/50, night, and terrestrial (image library).
I used the 17-40 (at the 17 end) for the Milky Way rising above the hanger, and also the across the sky mosiac. For comets and tighter stuff etc I have used the 70-200, sometimes at the short end, sometimes at the longer end.
I hate to sound like a broken record, but buy the best you can.
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