Guitar Nerds Anonymous

My experience with making music on a Mac was less than stellar, but that was a G4 iBook. Not too keen on Windows, either.

As far as software goes, I've heard and read positive things on Cockos Reaper, which I believe is now usable on both platforms, and not too expensive either.

I've been using Reaper and have found it excellent actually. I don't do anything fancy, just basic multi-track recordings and it works admirably. Not too pricey either as you say.