[882281223]

ok finally i decided to buy a new videocard but i just don't know which one to choose for me all of them seem to be the same
and these are the ones
ATI 4850
GTX 260
GeForce 9800
and Ati Sapphire 4870 1 GB (i like this one because you can play with maximum settings on gta 4)

ok there's some things that i'm looking for, as how well do they perform while playing videogames?
how much do they cost? and if you like one why, if you dislike it also why? your opinions are important and if you would like to suggest any card that you have on your computer or would like have running on your computer i am accepting suggestions i'll leave my computer's spects below and

thanks for your time all of you guys.

Windows: Microsoft Windows VISTA 6.0.6001 Service Pack 1
Internet Explorer: 8.0.6001.18372
Memory (RAM): 2942 MB
CPU Info: AMD Athlon™ 64 X2 Dual Core Processor 4400+
CPU Speed: 1005.7 MHz
Sound card: Speakers (Realtek High Definiti
Display Adapters: NVIDIA GeForce 6150SE nForce 430 | RDPDD Chained DD | RDP Encoder Mirror Driver
Monitors: 1
Screen Resolution: 1680 X 1050 - 32 bit
Network: Network Present
Network Adapters: NVIDIA nForce 10/100 Mbps Ethernet
CD / DVD Drives: E: ATAPI DVD A DH16A3L
COM Ports: NOT Present
LPT Ports: NOT Present
Mouse: 3 Button Wheel Mouse Present
Hard Disks: C: 326.0GB | D: 9.3GB
Hard Disks - Free: C: 200.0GB | D: 1.3GB
USB Controllers: 2 host controllers.
Firewire (1394): Not Detected
PCMCIA (Laptops): Not Installed
Manufacturer: Phoenix Technologies, LTD
Product Make: KQ422AA-ABA a6407c
AC Power Status: OnLine
BIOS Info:
Time Zone: US Mountain Standard Time
Battery: No Battery
Motherboard: ASUSTek Computer INC. NARRA3
Modem: Not detected
: