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@nigelbb odd my 3.1 wont let me upgrade the version of osx, are you shore you have not hacked your macpro 3.1?

@chrissomos + i do think macmin or imac with the option of eGPU later if needed is better, did not think of the option of the base imac with the option of a eGPU down the line if needed
To clarify, I mean a base model 27” 5K iMac.
 
Try macofalltrades.com. They have some really good deals on all models. You could also try OWC (eshop.macsales.com). They also have some great deals check them out.
 
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