How can I make my computer better at gaming?

[babachicken]

I currently own an HP Pavilion P7-1240.

Its specs are as follows

AMD A-10 5700 3.4ghz 4.0 turbo
discrete gpu radeon 7660D 512mb dedicated vram
10 gb ram
1tb hdd
msi jasmine 7776 motherboard
300w psu

the full specs are here
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03353576&prodSeriesId=5187022



i have about 200$ to spend.

what should i do?

 

[shishodia]

just buy the graphics card same as mine

 

[babachicken]

just buy the graphics card same as mine

what card do you use?
would my processor bottle neck it?
and i heard 7660D is best with 6770 discrete card...