In reply to Aberdeen Rambler:
Loads of my friends have Treks. Look lovely, I think one or two had frame problems but this was also true with specialized frames in both cases within a week or two they were replaced under warranty.
The most important thing is which one makes you smile.
Have a look at the Cannondales, I think the super 6 has been bike of the year or scored top in the C+ tests a few times and again being a big American bike company they back their warranty (quickly) if there are problems. Some companies can take a while and be a nightmare to deal with even if they do eventually get there in the end months later.
Cheers
Toby