Weatherall,
What are you going to use this bike for? Racing? Commuting? Riding 5 miles a week or 100, etc? That will help. I sent you to the Commuting Forum because you were looking for a rack and fenders, but is Commuting really your focus? That will help you decide if you should get "bomb-proof" or "lightweight".
FYI - that Scat is only available online in 48, but you may be able to find one in your size at your local Performance store.
Also, if you're interested in the Surly's, although you may not be able to find one locally to test ride, almost any LBS can order one if you know for sure that's what you want.
FWIW - I don't like seatpost racks either, but others will disagree.
Finally, if you have a problem with heelstrike, this solved my issue:
http://www.arkel-od.com/racks/redRoc...asp?fl=1&site=