I'd suggest looking seriously at Campag before you spend on SRAM.
Yeah, I know that Campag will almost send a bunch of guys in suits with strangely heavy violin cases around for a chat if you take their gruppo off road, but they actually work really well.
I run a mix of Veloce and Record on my cross bike. The Record is a square taper BB-crankset combo that got demoted from my roadie to the cross bike. Good thing about running a road crankset is that you can run 39 on the inner ring - "just like the pros do" - which is good if you're racing.
I've run a very wet and muddy season on my bike without any problems. I also used it as a summer commuter and off road trainer (bashed it all around the Gatineau Park if you know trails over our way) and as a winter/snow bike. Only problem I got was a bit of chain skip in heavy fresh snow or super muddy racing - ie., exactly what you'd expect.
I buy most of my stuff on-line from the UK - so my pricing comments reflect that. On that basis, you can buy all of the gruppo bits that you'll need for a cross bike for about C$100 less if you go Campag over SRAM - and you've got the advantage of better spare parts service with SRAM (Lamberts carry all the spare parts in the Campag catalog - plus I think that there's someone over your way who is also an authorised Campag wholesaler).
Another option - based on what I read on another thread - is to see about picking up some Raceface Cadence cranks ... since it looks like Raceface is closing up and will presumably have some stock to sell off ... Feels a bit like grave robbing though ...
Oh, and in case you don't trust the random recommendations of a stranger on a forum - Simon Burney (as in the author of the bible on cyclocross) recommended Campag over SRAM (and definitely over Shimano) when I was setting my bike up ... and I definitely trust him to know a thing or two about what works for cross ...!