MacBook 6,1

(Note the MPB 6,1 is different, of course)

The Core2Duo Mac laptops are very nice machines. J had a black one that was just a little too old to keep current. I had maxed out the RAM to 6 GB and installed a SSD, so it was plenty speedy. We finally got a 13" MBP a year or two ago to replace it. It doesn't really run any faster, and the screen is about the same, but it's "fully 64-bit" and can be updated, etc., etc.

Good luck, and good of you to help out!