This is exactly what I did last week, and I'm really glad I did it. I stayed up late and pre-ordered a White Mini (32gb), and received it on launch date.
As far as ergonomics go (weight, size, etc.), Apple nailed it and hit a home run in my opinion. I was coming from an iPad 2, so the thought of not having a Retina display didn't bother me as I hadn't yet been spoiled.
After spending about a week with the mini, I came to the conclusion that although the mini was cheaper ($170) than the full size iPad, the gap in price wasn't significant enough for me to not jump up to the iPad 4 to get the beautiful Retina display, and to also get the power of the A6X processor.
I can tell you that although the iPad 4 does indeed feel snappy, it certainly isn't anything significant over the mini, as it was no slouch. However, I tend to keep my devices for awhile, so I feel much better about spending the extra money and getting Apple's top processor, which in theory should run longer and better than the A5, and certainly be supported longer.
I'm not bashing the mini by any means, it really is a fantastic device that I'm sure millions of people will purchase and love this Christmas season. For me though, the better "value" by far was to spend the extra $170 to get the Retina display and faster (future proof) processor.
If and when Apple decided to put out an iPad mini that is on par with it's full size counterpart, I will probably look at moving back to the mini.