Hey, guys, I need some help on deciding on a computer, specifically a Mac. First of all, I want to know: if I were to buy a really high-end, high quality computer, would it be obsolete and worthless within a few years? Generally, PCs tend to last only a few years.

Okay, so here is my situation:
I am in need of a better computer for music production. My current specs are as follows:
4GB RAM
2.80GHz AMD Athlon (tm) II x2 220 processor
500 GB HDD
Windows 7

I would like to take my production career to the next level with a MacBook Pro, but I am not sure which model to get and which specs to get. I'd be very grateful for all of the help I could get.

I am currently using Ableton Live 9.


Thanks!