Any bike can be used as a commuter. The cheapest solution would be to get the beam rack and change your seatpost to something non carbon fiber. You should also be able to attach a rack using p-clips. I am unsure about fenders and what would fit on your bike.

The second choice would be to get something used. Check out craigslist, coops, pawn shops, lbs that sell used, auctions, and garage sales. You could probably snatch something for not much money and purchase fenders, rack, and whatever else you need. My preference is the mid 80's - 90's rigid MTB's.

I honestly think a new bike such as a touring or cross bike would be a bit much just to have for commuting. However if you do plan on taking some kind of tour then get one.