The WNA1100 is 802.11n. as is the WNR2000. I don't see what is the problem.
New to networking, and couldn't find anything on this in the forums: any issue with using a Netgear WNA1100 (N150) USB adapter with a WNR2000 router? Would the N150, rated for 150Mbps, be a bottleneck for the router (rated for 300 Mbps)?   Thanks.
WiFi adapter vs Router