|"That chart jefro linked seems to indicate my GeForce 7300 GT outperforms the GeForce 210"|
Newer isn't necessarily better. You need to make the proper spec comparisons & that's not always easy due to constant changes in technology. Although the Geforce 7300GT was a low end card in it's day, there were even worse cards, the 7200GS & 7300GS for instance. The Geforce 210 is currently at the very bottom of nVidia's lineup. It's not surprising that the 7300GT performs better. Personally, I wouldn't want either one of them. The 9600GSO that was recommended to you 2 months ago was an amazing deal for $25, I don't know why you didn't jump on it?
As for the comment about DX9 vs DX10 vs DX11. I assume that at some point you'll be upgrading the OS to Win7?
"If NewEgg will waive the restocking fee, I'll do it"
Even if they do, you're still going to have to pay the return shipping fee. IMO, it's not worth it. You should be able to sell it for at least what you paid. If you plan on buying another card, wait til Cyber Monday & see what comes available.