Commuting - Specialized Allez Elite ($750) for bike trail commuting?

I have been looking to convert from my MTB with slicks to a road or cross bike for my commute. Many people have recommended a cross bike but I don't need to add fenders or a rack so a used road bike may work better for me. I have found a '08 Specialized Allez Elite for $750. Does this sound like a good deal?

My commute is mainly on paved bike trails (the local flooding has caused a few detours) and I would like to ride the local paved trails along the creeks for some differentiation from my normal mountain bike routine. I am looking to improve my average speed on my commute as well. When I put slicks on my MTB it increased my average speed a decent amount. Would the different riding position and 700cc tires increase my average speed even more?

Does anyone know how much this bike would weigh? It is a 54cm, and I can't seem to find anything on the web.

There is also a Cervelo p2 sl for sale for $150 more but I'm not sure what size it is. Just throwing some ideas out there. Thanks.

http://www.bikeradar.com/gear/category/bikes/road/product/review-specialized-allez-elite-10-35496/

About 21 lbs. according to the review, but I don't know if the 2010 model (in the review) still has the carbon seat stays which I think the 2008 model did. So it's possible the 2008 is a bit lighter.

The 700c wheels aren't going to help much in and of themselves. The riding position could but that depends on how aggressive your current bike is. If you have a long commute with few stops, a road bike might make a noticeable difference in overall time. If it's only a few miles and/or there's a lot of stops, it's not going to make much difference though you might enjoy it more.

My commute is between 6 and 10 miles depending on which way I take but there is only one place I have to stop.

Going from a mountain bike with slicks to a road bike will probably decrease your commute time by 2-3 minutes each way at that distance. Riding as hard as you can and getting in better shape will decrease your commute time even more.

I went from a mountain bike to mountain bike to slicks to a hybrid (mostly road, just with flat bars), and each time increases your speed. I think the last one made the biggest difference because of the frame geometry and weight. I'd also recommend clipless pedals if you don't have them already.

That is one reason I believe that I can reduce my commute time. On the days that it is windy, not having drop bars kills my motivation. I figure the faster I make my commute, the longer distance I am willing to ride in. The more miles the better.

What does anyone think about the price? $750 for the '08 Allez Elite?