Please check build and suggest video card!

I'm thinking about taking a shot at building a cheap computer for my 7-year-old son, who just needs something to surf the web. Here is what I am thinking:

Case Antec NSK4480B
Power Supply Antec 380W (incl. w/case)
Motherboard ASUS M2NBP-VM CSM (socket AM2; Nvidia Quadro NVS 210S/ Nforce 430B))
CPU AMD Athlon 64 3200+
Memory Corsair XMS2 2GB DDR2-800
Graphics Onboard GeForce 6 GPU
Hard Drive Seagate Barracuda 7200.10 80GB
Optical Drive Pioneer 18X DVD+/-RW
Audio Onboard ADI AD1986A
Media Reader Ultra Products MD2 5.25" bay (ULT33069)
OS XP

Does anyone see any compatibility issues? Also, my son will probably want a fairly large (19" or so) monitor. Would onboard graphics be sufficient? If not, can anyone suggest a video card that the Athlon 64 3200+ is capable of running to its fullest? Thanks for any advice!!