Not much to choose between them. The Trek has a burlier fork, but the drivetrains on both are a typical mix of budget Shimano.
If I had your budget to spend today, I would be looking at the Radons at Bike discount. Just as an example, in 2008 I bought a Cube Ltd Race for £750. The Radon ZR team 6.0 2012 they list at £600 is better specc'd than my Cube was.
Simply astounding value
Agreed. I wouldn't settle for Alivio and Acera if I could get better for the same money.
Boon, how much are those bikes you're looking at if you buy them in Spain?
For just over €700, you can get
this Radon in a 20" (my OH is 5'6" and rides a 16" Radon, if that helps to work out sizing). I think this is the one Cubist was referring to?
The ZR Team 5 they list is as well specc'd as the Trek and GT and will cost you 100 euro less. And it doesn't weigh as much as either of them.
Seriously, look at the Radon bikes. My OH's is lovely. I was looking at them myself, and the only reason I didn't buy one was because the ladies versions are much lower specced than the unisex at the same price point, and I'm too short to ride a unisex. Hence my Cube (on sale) worked out better value.
If you live out in the sticks, and you're worried about getting a courier delivery, Bike Discount ship with dhl, but it's handed over to Correos when it enters Spain, so it will go to your local post office.