P5 on OSX drove me nuts. P7 is pretty solid. However, if the new features of P7 are used, it doesn't play well with Carrara. You can crank out some great renders with P7 but Carrara is sooooo much nicer for that. If you're only interested in rigging up models, I'd actually get P6. For me, it actually loads faster than P7. Additionally, you might be able to get a pretty nice deal on P6 - and it does play well with Carrara. Personally, I like to have a wide selection of tools in the old 3d toolbox to work with. Upgrading to either P6 or P7 will make your life a little easier. Mark