currently running a 160GB unit, but size is not important - i could get away w/ ~80GB easy, so i figured i would just get the largest single platter drive. the laptop just feels slow - ordered more ram, messed w/ the "energy saver" setting in power management helped, but coming from a decent main rig w/ 15k scsi and ssd's, it is kind of a dog. only currently have 1GB so i was hitting pagefile a bit w/ illustrator, photoshop, premiere and sometimes solidworks open, so that will be gone once i get the additional ram, but i would like to move the hdd up a bit for all around responsiveness.