I've got a buddy with a t56...he loves it..hes running 3.90 rear gears with it and I think a 27-28in tire
I have a tr6060 for mine, if i ever get around to building it..
You can use one of the many rpm calculators to help pick a rear gear..based on your tire size and the rpm range you want for cruze rpms..
http://www.csgnetwork.com/multirpmcalc.html