How about instead of having three different sections within the MSP section, there is just the main part, instead of having it branch off at the top into the subforums.
Some suggestions:
One for the Protege, P5, MSP & MP3. No subforums. This will make us happy since the majority of the items listed in the old FS section were for us anyway.
Another section for the New Gen Mazda (look at how often things are listed in the Mazda5, MPV & Mazda Trucks and the Miata & MAZDASPEED MX-5 sections, do you REALLY need separate forums for those?) At least group them together more than they are. Then with the Mazda3 & Mazdaspeed3, group those together like the Mazda6 & Mazdaspeed6 already is.
For the WTB section, there needs to be one in each section.. if you're separating the FS section that much you might as well give each one it's own WTB section.
As for the "General For Sale" I personally am not going to post in there, as I want my items seen. I would rather post in the section that corresponds best with the item that I'm selling. If I have MSP wheels for sale, I'm going to post in the MSP section instead of the Wheels/Tires section of the General For Sale. The Group Buys are probably not going to get much attention there either, and it would be nice to see that subforum in the other sections that corresponds with that particular type of car that the GB item is for. I would keep the General For Sale for the Non-Mazda items and the Completed Transactions, and also add in a subforum for Member Seller Ratings.