Can you get a picture of your case as it's currently set up? That would help folks come up with some ideas for you.
If you truly don't have much room inside your case you can either use a Swiftech radbox to hang the rad off the back of your computer, or you can try mounting it up top like this....
Case Pics . Have a look through the rest of the case pics, and/or the WC pics, you'll find a ton of excellent ideas to get you started.
Welcome to HWC!!!
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