You don't even say why you want to return it.
I've personally contemplated getting the Galaxy Nexus (unlocked), but I'm torn between the two.
The main GN selling points for me are the higher res display, notification light and NFC out of the box. On the other hand, it's got a crappy camera, no LTE (plus I'm hearing lousy signal and data speeds on AT&T).
What I love about the SR is obviously LTE and the camera, but on the other hand I hate the 800x480 res and sound quality of both ear speaker and loud speaker is sub-par. Plus, no notification light is killing me, reminds of my days with an iPhone. Why does Samsung omit this feature is beyond me.