Graphics Cards for Dell Inspiron 660

I recently ordered a Dell Inspiron 660. It comes with HD integrated graphics but I was wondering what upgrades might be possible for this system. I know that there are only limited upgrades available for this, and its not meant to be a gaming rig but i wanted to at least make it decent. I might consider upgrading the PSU and would greatly appreciate suggestions for cheaper PSUs and graphics cards to go with it, but please also suggest video cards that might work with its stock 300w PSU.

I got the 549.99 version
http://www.dell.com/us/p/inspiron-660/pd


Some general specs of the system

2nd Generation Intel® Core™ i5-2320 processor (6M Cache, 3.0 GHz)
300w PSU
8GB3 Dual Channel DDR3 SDRAM at 1600MHz
1TB Hard Drive, 3.5", 7200rpm, SATA

I was thinking of the Radeon 7750 but I'm not sure this unit has enough power. I hope to spend under $200 if possible. I hope to be running games like Battlefield 3, maybe on medium to high settings, and other than that mostly simple games like Arma 2, CS:Go at a decent frame rate.

Thanks in advance