I guess it all depends on when and where you're coming from...
In general, where are you located?
In terms of Oakland County, about 33% of the population lives in the areas I mentioned which include Novi and the immediate surrounding areas. About 21% of the population lives in the areas you've mentioned.
You make it sound like Novi is gridlocked from 9-5 which is simply untrue. Sure, rush hour is busy, just like it is in Southfield at 696/M10/Telegraph, or I-75 and Big Beaver, or countless other places.
Southfield is really the epicenter of the Oakland County suburbs, but that's a tricky city for the higher end providers for several reasons. For this reason, I stand behind my assertion that going a little West to Novi is a good choice of location to entertain. Four major expressways converge there (I-275, I-696, M5 & I-96). This does make it more difficult if you're east, especially if your east of say Royal Oak.
I really think you're overstating the congestion a bit. I'm also not saying that the areas you've mentioned are not good suggestions, they are, but from a marketing perspective I just don't think they're much better than Novi.