I haven't used Logic Pro, so I'm not sure if you'd run into issues with it. I was using a 2010 2.4 Ghz i5 Macbook Pro with 8 GB ram, and I used to run into some overload problems whenever I had lots of tracks and effects, but since I upgraded to a 2013 Macbook Pro with the 2.9 Ghz i7 processor and 8 GB ram, I haven't had any overload issues.
If you plan to use Reason at all in the future, you might want to consider the $150 upgrade to the 2.9 Ghz i7 processor or a used or refurbished model with a faster processor.
