Help on choosing a new card

I bought this computer 2 months ago - http://www.newegg.com/Product/Produ...IsFeedbackTab=true&Keywords=(keywords)&Page=1 And absolutely love it.

I can play games on higher settings with not much lag. But if I go beyond that into ultra high maxed out type settings it does start to get a bit noticabely laggy. So i'm looking into a new video card. I just don't know where to start. I don't understand which ones will fit in my computer - size wize and plug wise. I also heard you need higher wattage power cords when upgrading the card. If anyone could guide me or give some advice that would be awesome. Thanks for your time
 
a 6770 would probably suit you perfectly and have some extra power to spare for ~115+, also can you open the case and tell us what is on the side of the power supply, as in the make and model.
 
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