If you're wanting a gaming laptop buy one that's already made, I bought myself an Acer - not tried UT3 at full settings, nor will I (doesn't appeal to me)
Just get anything that exceeds the recommended settings - if you want your gaming experience to last go quite high spec - having things like GeForce 9800 (or 8800) will do justice, if you're going to Run Vista, spend a bit more on RAM, if you're going 64bit, then may as well take advantage of it as well.
"Experience never provides its judgments with true or strict universality; but only (through induction) with assumed and comparative universality." - Immanuel Kant