I want to buy a scanner... but I want it to be thin (like the Cannon LiDE scanners). The LiDE 60 is about $30 more expensive than the LiDE 25 and the only difference is that it has USB 2.0 hi-speed. I imagine that these scanners are more limited by the speed that the actual sensor moves rather than the interface. Will the LiDE 25 be much slower? Anyone know?