This is a question for PC users of Reason 6.
I have a Mac-based production studio, and I run a multitude of applications on a high end Mac Pro. I've decided to create a second workstation based solely around Propellerheads Reason 6. I haven't built a Windows PC in so long that I'm having trouble discerning the real-world differences among i3, i5, and i7 processors in terms of track count and robustness.
I know that this is a loaded question with only the hope of anecdotal answers, but that's exactly what I am looking for. What processor has worked for you where you feel comfortable? Let's say 32-48 tracks of audio with 40 instruments max.