Do you really the "Pro" version? Settling on a Mac Book saves some cash.
I use mine as part of my business, so I budgeted for it and bought it after some jobs. It has paid for itself several times over, I feel. Plus as a capital purchase I got to write off the depreciation against profits.
We always buy our Macs now from the refurb store. You save some money, and they are sold as good as new - though we actually think they are slightly better than new since each unit will have been individually inspected.
I'm not one to say "Don't go into debt." A little debt can go a long way to make your life easier, it's the Big Debt that can bite you on the bass. If you have some "assets" that could be sold to pay for the MBP, but you prefer not to - than taking on some debt for a short period ('cause you have a job to pay the debt off) is, I think, a good decision. If you lose your job you can still sell off the assets to pay off the debt. Its the people who take on so much debt that they can't pay it off that get into trouble.
Also, buying a "starter" notebook initially (like a 13" MB), and then over time trading it for better and better systems is also a good plan. Before my 15" MBP, I used a 13" iBook G4 for a few years. Oh boy, was that a nice upgrade!!