Purchase Advice for a Fellow Revit User

I received a message the other day asking me for advice; that classic conundrum Mac or PC? I don't have a Mac and rarely get to use one. I do know quite a few people who love their Macs, likewise for PCs. I thought I'd share some of the message here and see what sort of comments it might spur, advice or otherwise.

He writes:

I am hoping to get some advice from a fellow a Revit user about a pending purchase decision.

I have been using Revit now for almost 4 years, even somewhat addicted in spite of it's occasionally awkward ways. A client has offered to buy my next computer and has offered up a spec for an Intel PC. I'm using a 2009 iMac w/ 8 GB RAM, Intel 2 Duo 2.93 with 6 MB L2 NVIDEA MCP79. I run Revit using Parallels. I recently found out about maximizing the RAM in parallels and accessing the 2nd core processor and it has helped to speed up Revit.

I was having some performance issues (slow response) using materials palette. It could take 30-40 seconds to open up and I did have some wicked crashes. But after making the adjustments I have found it quick, responsive and stable. I was having 45 minute restarts but now it works smoothly. I have heard of people running bootcamp but I can't at this point because my partition is too small and I'm not eager to reformat my current setup.

I'd prefer to stay with a Mac but I get that Revit doesn't run on the Apple OS. Should I stay or should I go?
Btw, I also got a quote for a Boxx PC but it's expensive.

Looking forward to your thoughts.

What say ya'll?