The DCII and the DCII TOP differ in only one respect. During early production runs, Asus felt the need to hand bin the best GPU's for the TOP line. As the production line matured, Asus stopped this practice and the TOP appears to no longer be in production.http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_670_Direct_Cu_II/33.html
(80.6 fps in BF3OC'd)http://www.techpowerup.com/reviews/Gigabyte/GeForce_GTX_670_Windforce/33.html
(79.7 in BF3 fps OC'd)
As you can see, they are very close in performance. If nothing in the review lifts one over the other in your estimation (personally I favor the Asus based upon noise levels and customer service experiences), I'd think about matching the manufacturer of your MoBo if for no other reason that if you have a tech support issue, you eliminate Technician's Option No. 1 which is to tell you "It must be the other hardware manufacturer's problem".