If this helps alot here. But i'm looking to upgrade my graphic card to play Tera and guild wars 2. If i can do this all under 100-300$ thats would be great.
Time of this report: 1/22/2013, 17:15:06
Machine name: DEBRA-PC
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.120402-0336)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Inspiron 518
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz (2 CPUs), ~2.2GHz
Memory: 3070MB RAM
Page File: 3259MB used, 3127MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
DxDiag Version: 7.00.6002.18107 32bit Unicode
Get a used core 2 quad processor as your processor is really slow and will bottleneck most cards. If you do not plan to buy a new processor Get a HD 7770 for $120 and you'll be fine since your requirements are low too.
What is your motherboard model? I guess you have a LGA775 socket so go with a core2quad processors and since the processors are really old you won't get it on newegg. Your best bet is to get a used processor from eBay or someplace.