Mind what chaospker says, his drive is just defective. My 250GB 7200RPM drive is silent and doesn't run hot at all. There is NO NOISE coming from it whatsoever. It depends on the model, brand, and just the quality I guess. Mine is perfect and the speed is VERY noticable.
However in your case, I think it would be better to put the extra money to getting the T9300 with 250GB 5400RPM just so you have the extra processing power.
I was one of those worried too about loudness and head of the 7200RPM hard drive since Ive been used to 5400RPM drives in laptops, and to be honest, none of those problems have occurred and despite suspecting heavy drains in battery life, Im able to get 2 hours and 39 mins on my 6cell. Then again I do have the LED screen.
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