Setting up a home studio for the first time (Newbie). I have a 2008 2.8 GHz Intel Core 2 Duo iMac running OS X 10.6.3 with 6GB RAM. Which Reaper version should I get?
Short answer: 64-bit if your installation of OS X is 64-bit too.
32-bit is a better choice only if you use lots of plugins (sound effects) that only have a 32-bit version available... Which is probably not the case since you are just starting up.