I'm also in the market for a similar level of bike, so I'll share my experience on test rides.
S-Works E5 2005 (I think this is carbon?)
Aluminum, but a nice bike. Questionable geometry for a female rider unless you have an unusually long upper body. It's bad enough for me as a long legged guy (I'm kind of short in the torso, long in the legs, but perhaps not quite so much as many female riders). Sat on it but the combination of geometry and price deterred me from a test ride.
Tarmac Pro 2005 (carbon and Al.frame, how's that work?)
Carbon on top, Aluminum downtube and chainstays. Rather like the LeMond pattern on a lot of bikes. But I've never ridden one. The LeMond Zurich (Carbon/Steel) interpretation seemed to focus on zippy performance, I wasn't particularly impressed with the ride.
Roubaix Comp Double 2005 (very carbon)
Out of these bikes I think it is your best bet; the geometry favors a short upper body and it would be my personal choice. The ride is sensationally good on broken pavement with the bumps as smothered out as on a mountain bike; it feels a bit too dead on good pavement, but in reality it is very fast. A bike with performance AND ride. I have test ridden an '04 comp and an '04 pro, same frame on both. Incidentally the cheaper aluminum/carbon Roubaix (105 group except Ultegra rear derailleur) also rides very well; not quite THIS well, but better in my view than a carbon/steel LeMond. For '05, the Elite is carbon too. But looks like the Carbon bikes aren't out till December. Both the Comp and the Elite have the FSA Carbon crankset for 05; having ridden with an FSA crank on an 04 comp and having ridden both Ultegra and 105 cranks on Roubaix bikes, I really do think the FSA helps the shifting compared to a standard Ultegra or 105 crank.
Allez Comp. Double 2005 (Al.)
Just about as aggressive geometry as the E5. Not quite as fancy a bike. But very close, impressive enough and probably more comfortable because it has carbon seat stays, which are definitely not on the 04 E5 and I don't think on the 2005 E5 either. I've ridden an 04 comp which has no carbon stays and a slightly lower grade of aluminum than the 05; it is a nice bike but the geometry would cause me back trouble.