I don't think Motel 600 collects any more then normal DOT3/4/5.1. All brake fluid regardless should be flushed ever 2 years no matter what, more if you get a lot of heat in it.
As for cheap rotors not being good for track duty, I don't think its a problem. I get the cheap ones from RockAuto and have taken to MidOhio and lots of AutoX abuse. If they are true they should be fine. Obviously one should be checking them over after hard track events. And they are much cheaper if you do wear them out a bit earlier. you can also send them out for cyrotreatment for pretty cheap, extends life about 3 times. Honestly I put more abuse on my rotors at my autocross events then I did at the track event I went to. On the track they actually get a chance to cool off a bit between corners.
The Massive Brakes package is very nice, but serious overkill for AutoX. If you were doing heavy track days I'd say its worth looking into not for the increase in braking power, pads can do that, but the extra heat elimination factor of larger and thicker rotors.
I highly recommend the Panther+ if you want max autox stopping power, but they also make a Bobcat compound, works at lower temp range, don't know if its approved for anything more then a light driver's school event, but its suppose to dust a lot less and be pretty much noise free (at least while not braking). I haven't used them, but know a Subie WRX guy that likes them.
