The problem that you will have is the fact that the power supply unit (PSU) in the computer is only 180W. I suggest that you get a PSU with at least 500W. You should choose a PSU that you like and get the measurements of it. Then, measure the space where the PSU will be installed to ensure that it will fit. I like Corsair products. Also, modular PSU's are better for small cases. You only use the cables that you absolutely need.
If you upgrade the PSU, here is a video card that will give you good performance. It will definitely fit into your case. Read the Customer Reviews to see what users have to say about it.
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Intelligence is God given. Wisdom is the sum of our mistakes!!