I'm finally getting my first Mac , a dual 500mhz G4.

He currently has the Radeon 9000 the 64mb card and since I use Maya(3d Programm) I was wondering would it make a difference if i stick in a better card in this dual 500mhz?

The person I'm buying it from wants to sell the 17" flat panel with the computer all for $1,000. My question is how hard would it be to resell the 17" flat panel?