+T for getting the MBP. I really love mine. Just one quick suggestion: Make sure to calibrate the battery during the first cycle as per
Apple's specifications. I did not do that when I got the MBP and now the battery health is down to 69 percent after only 20 cycles.
Anyway, I really love Apple Logic as a DAW software. It seems to have every feature I will ever need. I have never tried to stretch audio with it, but according to the manual it should be really easy. On the other hand, if you have an external M-Audio interface, you could try ProTools M-Powered. I believe there is a trial version somewhere on the ProTools web site. These are just my 2 favorites, but for the Mac there are many programs that should be fine for editing audio...