I use to believe that you needed to send your tracks to be mastered by other folk.. That's until my boy set up his studio.. Listen to this seriously.. I've heard his track.. THEY SOUND GOOD EVERYWHERE..
This dude has a simple setup..
Mackie 1604 w/ a compressor going into a soundblaster card, recording with n-track and TC plugins..
He monitors with Event 20/20 passives running through a Hafler TA-100 Amp, using a tascam tmd-1000 as an eq..
What he did esessentially was to
1: Take a cd which you think has the best overall mix (R-Kelly's TP2.com was has choice)..
2: Eq your monitors to the source CD using a parametric eq (he uses the tascam tmd-1000 for this purpose
3: Take each sound from your synths. (He has a proteus, trinity, and
a JX-305, and eq each channel (kick, snare, hh, etc to sound like the source CD..)
Mind, you will still have to do some tweaking here and there, but what he does works.