You should read John Grubers blog, it gives great perspective on the mini in regards to retina display (or lack of)
http://daringfireball.net/2012/10/ipad_mini
I really can't relate to John Gruber though. He runs a technological blog. He had to buy the iPad Mini because his work requires it. So he can complain of or make excuses for the lack of Retina all he wants. At the end of the day, he'll buy this iPad Mini and then next year's iteration too. I don't think it's prudent for me to do that though.
Truth is, Apple could have charged me the exact same price as an iPad 4 if the Mini had a Retina Display and I would have bought it. I just can't go back to non-Retina, so will be waiting for next year.