You said that you wanted monitors for a small room right? Then why go for 8" monitors?
You need a big room to support big monitors else you will have many static waves around in your room with 8" monitors, you can avoid it though with some (a lot) of bass traps around. Or go with it and use monitors only for the high end and mix low ends with headphones...
KRKs are very fine monitors, I own Rokit8 and I use them all day/everyday for around 3 years now. They deliver a more "normal" hifi sound and I like them cause its much closer to the sound you will hear from normal systems.
The HS80s are very sharp but have exceptional clarity with high frequencies (that makes them a little hard for your ears after long exposure though)
Mackies are not so good really they are like better PC speakers, the HR624 and HR824 are way way better but more expensive an any case.
My suggestions is you keep as much money as you can and buy the best monitors you can afford. The best advice on monitors though is to test them and decide wich one sounds better to your ears, monitors are a totally personal thing!
Another great thing to do is to buy some cheap monitors like KRK 6" for example or Yamahas and a good pair of headphones for cross referencing (especially the low end).
Cheers and good luck