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What is the best graphics card i can possibly get for a dell inspirion 545s? - dell system identifier

In one of a Dell Inspiron 545S, and I want the best graphics possible, here are the details of comp


Windows ®. A life without WallsTM. Dell recommends Windows 7
System Specification
System Specification
Inspiron 545S
(System Identification: 0G7WPAJV)

* Inspiron Desktop 545S SlimTower
* Home Premium Windows 7

Plan Price: € 359.00

Operating Systems
Genuine Windows 7 Ultra Memory Home
4 GB DDR2 SDRAM at 800MHz (2 DIMM) Hard Drive
640 GB SATA hard drive (7200 rpm) Media Bay
16X DVD + / - RW w / Double Layer Update capabilitySoftware
Windows Live
Microsoft Works 9.0
64-bit operating systems CDProcessor
Processor: Intel Pentium Dual-Core E5300 (2M Cache, 2.60 GHz, 800 MHz FSB), hardware upgrade
Dell USB keyboard input
Dell 19-in-1 card reader
125V power cord
2-Button Optical Mouse
No color Modem System
BlackCertified Piano Restored
RefurbishedChassis Type Certificate
Slim TowerBase
Inspiron DesktopTop 545S SlimTower

wats the best card, I get it? Thanks