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I'm not really up-to-date on all the cards now, so I won't recommend any, but I'll just say; if you're hoping for any modern, 'proper' gaming card, you're also gonna need a new PSU.
1) Get a low-power card, GTX 750 or GTX 750 Ti, as suggested above.
2) Upgrade your PSU to 600W or more and feel free to use any card you want.
Option 1 will cost you ~$120, will run AC just fine, but leaves little room for future games.
Option 2 will be much more expensive, depending on the card you choose, but will last a couple of years.
What is your budget?
The GTX 550ti is very old (and slow) and consumes more than 110 Watts, whereas the GTX 750 consumes only 55W.
http://en.wikipedia.org/wiki/GeForce_700_series#GeForce_700_.287xx.29_series
In the second last columm you find the values for Thermal Design Power (TDP).
With your 300W PSU, I wouldn't recommend going over 80-90 Watts.
http://www8.hp.com/uk/en/products/desktops/product-detail.html?oid=6777100#!tab%3Dspecs
Not an owner of the card but I assume they require this, did you plug in the power to the video card from the new PSU? normally 4 or 6 pin connector.