Get a new wireless card
Get a new video card
Give up and go back to Windows
;-) Just kidding. The nVIDIA driver works fine on a 2.6.x kernel. I'm running a GeForce 6600 GT on 2.6.13. You will have to reinstall the driver after the kernel upgrade, though.
I used Debian for about a week, so I can't give you much help with the kernel install. I'll bet that the Debian forum here can, should you need it.