If you want to buy something really versatile you might consider a jacket with zip off sleeves. I have this one in yellow and love it. It has 2 pockets in front and one large one in the rear. I can zip the sleeves off and wear just the vest or the whole jacket stuffs into the rear pocket and has straps to hang it on the bike. I wore it on the ride this morning when the temps were in the high 40's at start time and in the low 60's by the time we finished.

http://www.nashbar.com/profile.cfm?sku=16455