In all honesty go with a Viking. Same basics as the kitchen aid, but actually has all metal parts. The kitchen aid are starting to be made with more and more plastic parts and just aren't lasting.
I don't know about the new KA, but the Viking has little wheels on the back of the base to help move it around the counter top.
We had a KA before the Viking... That one was about oh 25 years old. >.< We were due for a new one. We do a lot of baking and cooking. So our mixer gets used at least every other day.
We have the 7 qt professional in red - 7-Quart Stand Mixer - VSM - Viking Range Corporation
Well worth the money, and compared side by side with the KA the Viking won hands down.