what is better? 2400 pro, 1950xt, 7900gt, 8600gt?

I got a hp pavilion a6109n here are my specs, Specifications * Processor: AMD Athlon 64 X2 3800+ (2.0GHz, 2000MT/s System Bus) * Memory: 2048MB PC2-5300 DDR2 SDRAM memory (2x1GB) (expandable to 8 GB (4 x 2 GB) (64-bit OS)/ 4 GB (4 x 1 GB) (32-bit OS)) * Hard Drive:320GB 7200RPM SATA 3G (3.0 Gb/sec) hard drive * Optical Drive: 16X DVD(+/-)R/RW 12X RAM (+/-)R DL LightScribe SATA drive * Video Graphics: Integrated graphics * Network Interface: Integrated 10/100BaseT network interface * Sound: High Definition 8-channel audio * Fax/Modem: 56K bps data/fax modem * Operating System: Genuine Windows Vista® Home Premium * Refurbished (90 Day Manufacturer Warranty) External Ports * 6 USB 2.0 ports (2 Front, 4 Back) * Front panel 15-in-1 memory card reader * 2 FireWire (IEEE 1394) port(s) (1 Front, 1 back) * 2 PS/2 * LAN * Headphone; Microphone; Line-in (Front) * VGA-out * SPDIF out (coaxial) * Audio (side speaker out, rear speaker out, center speaker out, line-in, line-out, microphone) (One Each) Expansion Slots * 2 PCI slots (one available) * 1 PCI-E x16 slot (available) * 1 PCI-E x1 slot (available) Expansion Bays * 2 external 5.25"(one available) * 3 3.5" (two available) what more do i need? and also i know i need a new graphics card, i have a budget of 110 i want to play it on at least medium thanks in advance

i have 2.0Ghz is that good or bad?

[This message was deleted at the request of the original poster]

[This message was deleted at the request of the original poster]

lol sry one more thing, it has 2.00 ghz, is that bad or good?

thanks dude ur a big help

thanks i get it now but one more thing what does the 28amps mean?

if i get a geforce 8600 gt, would i need a power supply? how many watts? and those are to much for my budget but thanks i thought my stuff wasnt even close to running it

i have a HP pavilion a6109n with a dual core 3800+ 2048mb and a 6150 se graphics. can someone tell me what else i need, or to upgrade?