HD 6450 Upgrade

Hey guys, I was wanting to upgrade from my Radeon HD 6450 to something better, I'm thinking along the lines of a 1GB or 2GB single slot card. Just want'd to see if anyone had any suggestions before I went out and picked up something. 

The PC is a Hewlett Packard HPE-500y

300w PSU

Phenom II 1045T CPU

Any suggestions would be appreciated, thanks in advance. 

I would suggest a 7750, most of those are single slot and have a lot more power- If you are looking for a red/black I would suggest: http://www.newegg.com/Product/Product.aspx?Item=N82E16814131481

If you are looking for blue/black I woud suggest: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127709

If your wanting more nuetral colours: http://www.newegg.com/Product/Product.aspx?Item=N82E16814150612

 

the power consumption of these cards are legendarily low, at peak there have been results at around 50w, but I would still suggest a PSU upgrade for not-so-far-into-the-future upgrades, If you have money: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026&Tpk=cx430

if not: http://www.newegg.com/Product/Product.aspx?Item=N82E16817822011

of course I would suggest getting the cx430, it has much better efficiency, and not as loud as you would think

To be honest, at idle the 7750 gets even better power consumption than an average 6450, but on load it can take a higher amount

The PowerColor seems like it'll be the best option for me now. 

Sadly I wouldn't be able to upgrade the PSU on this system, not enough room, which is fine, I just want a small upgrade for now and later on I'll build a better rig overall. Thanks for the suggestions man,