Dell Vostro 460 for Etherium Mining

Good morning! I recently picked up a Dell Vostro 460. Please see Speccy details below. 

Summary
Operating System
Windows 10 Pro 64-bit
CPU
Intel Core i5 2400 @ 3.10GHz 71 °C
Sandy Bridge 32nm Technology
RAM
16.0GB Dual-Channel DDR3 @ 665MHz (9-9-9-24)
Motherboard
Dell Inc. 0Y2MRG (CPU 1) 47 °C
Graphics
DELL 1908FP (1280x1024@60Hz)
Intel HD Graphics (Dell)
Storage
465GB Seagate ST3500413AS (SATA ) 35 °C
Optical Drives
HL-DT-ST DVD+-RW GH70N
Audio
High Definition Audio Device
Operating System
Windows 10 Pro 64-bit

My goal is to add an 4GB AMD GPU in order to mine Ethereum. Do you know which would be compatible and be the best for this build? I got pretty lucky with it so far. It has a stock 350 Watt PSU installed. I might have to bring that up to 500 or 550 watts, but I need to keep costs down to make this project profitable.

Thank you for your help in advance!