Kleins use to be really good bikes, not sure now since their owned by Trek. The frame went through a couple of changes, some of the frames were made entirely in China and some just the aluminum part of the frame was made in China while the carbon fiber fork and stays were made in the USA.
Sorry, can't answer anything more then that; at least with the Cannondale up until last year were made in the USA, now they too are made in Taiwan.
I would think that an older made in the USA Cannondale would be better then a made in China Klein/Trek. I suggest, if you can, ride a built up Aura XV and see if you like it, otherwise you might buy the bike thinking you got a great deal then end up not liking the ride.