Looking for a GPU that will work with my setup.

I am looking to put some money out for a new Graphics Card, along with anything else that will help improve my games. Currently I am using a prebuilt gaming(shouldn't even be considered as gaming)desktop. The specs are in the link below...
I do plan on upgrading at least a part a year to keep it up to date with the latest stuff and make sure I don't fall too behind.

I have been told that I need to replace my graphics card as it is pretty weak. I was planning on switching to a ASUS GTX 660, but will that mean I have to change my PSU? It's a 460W right now an if I do have to replace it, what should I get. Money isn't too much of a problem as long as I won't be having this exact problem 10 months from now. Just to clarify, will this fix the problems I have been having while playing Borderlands 2 and other intense games? I already bought a new monitor and that kinda helped but not much. I game on this:

And lastly, I know the case is kinda ugly and cramped. I was planning on switching to a Bit Fenix Survivor because a local store has a white one on clearance for 50 bucks. Plus it's one of the nicest looking cases with a built in handle IMO. Sorry for the long message, this has just been frustrating me for a while. Thanks in advance :)
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  1. A 450W power supply is more than enough for a 660, assuming it's a decent quality PSU. What make and model supply is it?
  2. I don't know exactly what PSU it is. Is there any possible way to check if I open it up? Thanks
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  3. Best answer
    Yes, there should be a sticker on the side of the PSU. Can you take a photo? As well as the make and model it will have the really important info - how many amps the supply can provide.Will look like this
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