I have major oil consumption on my speed 3. I'm burning probably 1qt every 500 miles and I'm only at 101k. I'm pretty confident that it's the rings. Seems pretty common on this car. I would purchase knowing that you will probably have to rebuild at some point. As long as you don't forget to add...
Powersteering should be M5(as in Mazda Five) not Mercon V. Don't know how much of a difference it will make for the PS but it makes a huge difference on mazda's automatic transmissions.