What kind of music are you recording? That will determine a lot of what you ned to get. Also you should get a good pair of monitors that can represent back an accurate picture of what you are recording- What about acoustics in your space/ Have you got any acustical treatment?

These things in order of appearence need to go ..

1.Stereo Reciever , 2. Two decent home-made speakers, 3. Six Channel Behringer Mixer ....

1. You need a decent power amp that is voiced flatter and with lots more power than most home recievers.
2. You need studio monitors.
3. The mixer works but is not the most reliable and doesn't offer the best sonics around.

Behringer gear on the whole is questionable and doesn't enjoy a good reputation.

Monitor choices are very personal and subjective. The way your listening enviornment is set up plays into the equation as well. There are lots of threads here at RO regarding monitors. Just do a search on the word "monitors".

The Haffler P3000's are good affordable power amps for home studios. They run $700 new but I have seen them used for as low as $250.

You also need to treat your listening room acoustically. You can read all about that and ask questions in the Acoustics forum..

I am recording mostly soft rock, using acoustic guitars, keyboard and vocals.

The room I use is large and mostly soundproof, and within that room, a small soundproof room, which I'm not sure if I should use for the instruments/vocals or the recording room?