I see a PCI Express slot, but no AGP. So look for a nice PCI Express graphic card. Of course, if you extend the Video Card that you have to use 128MB, and you ADD more RAM, you might not need a better video card for that game that you want to play.

Expanable to 2GB, visit http://www.coastmemory.com and get MUCH more RAM. Get TWO 1024MB-533MHz DDR2-533 PC2-4200, 240p DIMM, 1.8v memory modules for $99 each.

Here are your specs from the eMachines website:

CPU: Intel® Celeron® D Processor 352
(3.20GHz, 533MHz FSB, 512KB L2 cache)
Operating System: Genuine Microsoft® Windows® XP Home (SP2)
Chipset: ATI Radeon® Xpress 200
Memory: 512MB DDR2 (1 × 512MB), 533MHz (PC4200)
Expandable to 2GB
Hard Drive: 80GB (7200rpm, 2MB cache)
Optical Drive: 48x CD-RW/DVD Combo Drive
Media Reader: 9-in-1 Digital Media Manager™ (Memory Stick®, Memory Stick Pro®, MultiMediaCard™, Secure Digital™, CompactFlash®, MicroDrive, SmartMedia, xD-Picture Card™, USB 2.0)
Video: ATI Radeon® Xpress 200 integrated graphics
Up to 128MB of shared video memory
PCI Express (PCIe x16) slot available
Sound: 6-channel (5.1) high-definition audio
Network: 10/100Mbps integrated Ethernet LAN (RJ-45 port)
Modem: 56K ITU v.92-ready Fax/Modem (RJ-11 port)
Peripherals: Standard multifunction keyboard, 2-button wheel mouse, amplified stereo speakers (USB powered)
Ports/Other: 5 USB 2.0 (1 in front, 4 in back), VGA External Connector, serial port, parallel port, 2 PS/2 ports, 5 audio ports (2 in front, 3 in back)
Dimensions: 14.25"H x 7.25"W x 16"D
Weight: 22.5 lbs

Good luck and Happy Computing!