um how about this most people don't want to go through the hassle of installing a new processor in the mac pro and any system how about this for 500 u upgrade the iMac to a 3.3ghz intel core i9 6 core and have a machine that gets 20k on gekkbench cus i don't want to and how about instead of a decent monitor for a couple hundred i get a 1k one thrown in and ok if u want to go there then say u just bought a used iMac 2010 2.93 i7 and upgrade that for the same but get it for 1400 think about it
Your suggestion (or suggestions? I can't really make out what you're saying in the stream of words and fragments you've written) does nothing to address the main point in wonderspark's post (which you've quoted). The iMac does not dissipate heat well, and for some that is a critical issue. Not to mention all the things ActionableMango mentioned as well, which are not covered by the iMac. I'd also add that the Mac Pro runs much more quietly.
Really, for the vast majority of Mac Pro users/buyers, the appeal of the Mac Pro is only partially about horsepower, and much more about other professional (or power user) needs. Using wonderspark's suggestion, not only would one's Mac Pro be much stronger in the bang-for-the-buck category (than other Mac Pros), you would still get a MAC PRO and all that it is (and that a closed-system iMac, no matter how powerful, could never be).
mayhone1- did you make a decision? Just curious which way you end up going.