Help me RPS, you are my only hope.

My loyal 9800 GTX is dying (artifacting, bsods, general tantrums) and I want to replace it. Thing is I have been out of the loop for so long I have no idea which way is up when it comes to graphics cards any more, and so I am turning to the good folk of RPS for some advice.

I would like to get an nvidia card simply because I am familiar with their products (and slightly biased against ATi cards after a bad experience with one in my childhood) but other than that I have no idea what to look for.

Relevant information:

Motherboard: ASUS P5N-D 750i
PSU: CORSAIR HX 620W MODULAR PSU
Current card: 512mb XFX 9800GTX
Budget: as low as possible while maintaining at least parity to my old card, like everyone I am broke as hell