I disagree with anyone who says that a 9800-level video card is overkill on a 1.4 Ghz computer.
Heck, I switched from a Geforce 2 to a 9600Pro on a P!!! system (now I have a P4) and it made a difference. In Warcraft III, the game always chugged during a big battle, and I always thought it was my CPU (I ran the game in 16-bit color, trying to make sure it wasn't the vid card that slowed the game down). With a 9600Pro, the game was probably SLOWER (as compared to on a GF2) when there was nothing happening, but the game didn't slow down during a big battle.
For DirectX 8 and 9 games that use shaders intensively, video card is more important than CPU. A 1ghz + 9800 will smoke a 3 ghz + GF4. On the other hand, for a game like UT2003, get the fastest CPU possible.