Trust me, When it comes to graphics ATI is the best..... Nvidia Is known for their cheaper cards [under 80$] .....
take XFX 5770 Xream Edition..
Model
Brand XFX
Model HD-577A-ZNDC
Interface
Interface PCI Express 2.0 x16
Chipset
Chipset Manufacturer ATI
GPU Radeon HD 5770
Core Clock 875MHz
Stream Processors 800 Stream Processing Units
Memory
Effective Memory Clock 1300MHz (5.2Gbps)
Memory Size 1GB
Memory Interface 128-bit
Memory Type GDDR5
3D API
DirectX DirectX 11
OpenGL OpenGL 3.2
Ports
HDMI 1 x HDMI
DisplayPort 1 x DisplayPort
DVI 2 x DVI
General
Max Resolution 2560 x 1600
RoHS Compliant Yes
CrossFireX Support Yes
Cooler With Fan
System Requirements Minimum 450 Watt Power Supply Requirement
Power Connector 6 Pin
Dual-Link DVI Supported Yes
HDCP Ready Yes
Dimensions 8.5"W x 4.376"H x 1.5"D