Again, hope I didnt sound harsh to krudler, but I wouldnt worry about room treatment if I had $25,000 (unless the room had 2 walls and was adjacent to an airport)
. As Curteye said, you want a portable mix. If you were on a desert island with no car,tv,internet and you were sending masters off to end users then room treatment to get the perfect mix would have priority. However ,until you can afford this ,just listen to your songs in different environments. Play the mix in the car (yes,speakers are hyped) over your tv speakers, and at friends over there systems and post in Made with Steinberg section. If mixes that sounded great at home have too much bass for ex, just compensate when mixing, Better monitors are way more important .
#1 thing you need is to get started.