Current i7 iMac or older Mac Pro purchase?

I have an iMac Mid 2012 with i7 and I have a 2009 Mac Pro.  There is no comparison!  The iMac is faster at everything!  If I were you, I would wait at least until next week to see what Apple does.  My suggestion is get a new iMac when they come out, put an SSD inside the machine, and get at least 8 gig of ram.  You can always get external storage in USB3 or Thunderbolt.  Getting an SSD inside the machine will mean, you should not have to worry about a hard drive breakdown that you can not fix!  I hope Apple updates the iMac next week.  I need a new one too.  I hope this helps.

Kevin