I've got an old 2006 MacBook, running 10.6.8, 2GHz Intel Core 2 duo. Ram is maxed out at 2 GB, with an 80 GB HD. Takes forever to boot up, but actually runs pretty good. I've been thinking about putting in a 128 GB SSD. Seems simple and not very expensive. My question is whether this will substantially improve the boot up time and overall performance. Or do I just put the $150 towards a new Air ? Thanks.