Sage advice Sam, will do. Realistically, due to certain recent purchases (and I think you know which one) I won't be in the market until probably January 2014, which should give more than enough time for the Mac Pro to come out and for reviews and benchmarks to come out.
Also, a bit disappointed about lack of Thunderbolt 2 on the new iMac. I know the specs on TB1 are lightning fast, so maybe this is an unnecessary worry. But the trade off I'm doing with either the new iMac or Mac Pro will be to move media I'm working on to external storage (I can't afford 1TB SSD prices). But large RAW files, for which I'll have to do batch tasks to, and large music files always play nicer with faster throughput so I was hoping for TB2. I know most externals are only TB1 but it would have been nice to know that I could take advantage of TB2 external HDs when they eventually come out.