More details need to be provided to choose the proper parts. A little gaming could mean anything from playing a CoD game every once in a long while to only playing flash games on the web. If you can be more specific you'll get better help.
No reason for a 500W PSU. 430 is more than powerful enough for the current setup. In fact, I'd go with a Corsair CX430V2 for $35 after rebate on Newegg.com (it used to be $25 after rebate). Smaller is better since your computer might draw 60-80W at idle and you won't be within the 20% load range. If you draw less than 20% load efficiency drops like a rock (typically to around 70% at 10% load on a quality PSU)
Now the question, is why did you add a video card? There is no need for a video card unless you actually play games. You say only a little gaming, which could mean anything from playing flash games on the internet to the occasional round of Battlefield.
If cheap is your goal, you could go with a A4 X2 3400 2.7GHz Dual Core Socket FM1 - Microcenter $70 - since that will handle everything you need, including Blu-Ray 3D if you want and some very light gaming. For the motherboard you'll have to switch to a FM1 socket so you could get the ASRock A55M-HVS Micro ATX at newegg for $65. And then drop the GPU. You'd end up saving ~$230 just on those three parts alone.
I agree with getting a 3.5" HDD unless that one is a steal. I won't recommend one since they are changing in price so fast (and almost always going up)
If you do need a GPU, you can get a better one for the same $100.
http://www.microcenter.com/single_product_results.phtml?product_id=0372693 - comes with a game and has ever so slightly better performance.
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