Bang Bang Boy wrote in post #11748911
Yeah definately return your XS. Purchase the Nikon. Carefully unwrap it and invite your friend over.
When he looks away you swing it hard and repeatedly in the back of his head. You then proceed to loot his corpse and pawn his car and for the findings you purchase a 1DMKIV...
Yes go for the Nikon...

This!
On a more serious note, the D3100 is a better body. It has better high ISO noise, 11 AF points, spot metering, video, and is a higher resolution. It also costs about $200 more.
The question is, as a beginner, do you really care about these things?
Truthfully, the XS is still a wonderful camera in itself. Just hop onto the Rebel XS thread to see some pictures taken by it. Also, the ergonomics on the D3100 is completely different from the Rebel XS. It's personal preference, but chances are if you like Canon's Rebel ergonomics you might not enjoy the feel of the D3100.
And personally, I'd rather take the XS and spend the difference on a 50mm f/1.8. Truthfully, your friend just sounds like a gear whore.