Best GPU upgrade to my HD 6670 under $150

Hello everyone just looking to upgrade my gpu but I am very conflicted as to which card to pick as an upgrade.

Right now I game on a old 19 inch monitor which highest resolution is 1440 x 900.

I am running an A8-5600k APU overclocked to 4.3Ghz with a Radeon HD 6670.

Dont know what to pick from 7790, 7850, 650, 650ti. 

Also this is my PSU right now http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026

Just looking for some input at my options and if you have any other suggestions.

http://pcpartpicker.com/part/asus-video-card-hd7850dc1gd5

a 7850 would probably the best under $150 but a 2gb version or a 7870 would be better but it may be out of budget 

thanks for the input we ahead and got this 7850 from Amazon for $20 cheaper http://www.newegg.com/Product/Product.aspx?Item=N82E16814161426

i would say spend 10 bucks more. $159 after MiR.

http://www.newegg.com/Product/Product.aspx?Item=N82E16814202025&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

I would have done that but was trying to use my $20 gift card to amazon that I had. 

okay then i think this would be your best bet

http://www.amazon.com/HIS-DisplayPort-Express-Graphics-H785QN2G2M/dp/B007HYIDTC/ref=sr_1_3?s=pc&ie=UTF8&qid=1379462458&sr=1-3