The biggest issue you have is the fact that the pump is going to have to be completely sealed off to retain the functionality of a laptop.  If you want to carry it around or move it you will have to keep it completely upright so the pump won't be sucking any air (killing the pump and probably frying the computer).  You would also need to have an external fan for cooling the "water".

Keep your eyes on the Hardware Product Reviews, you should see something that will spark your interest in the next few days, hopefully.  I can't say more. I've said enough already.