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I am thinking about buying a new URL, but I can not think of a good one to buy.

My site is pretty much tech related, tutorials, graphics.

I'm sure any GREAT publicly suggested domain name would be scooped up before you had a chance to blink. Take some time and keep thinking about a great domain for your niche. When finding a great domain for my projects, I have used some of these tools in the past:
http://sixrevisions.com/resources/12-exc...main-name/

Create a short list and work from there - no rush unless you find a really great one!