No it would not. Monitors, those used in the studio, not on stage, are designed to be flat(ish) - because no monitor is really totally and perfectly flat. They are supposed to give an accurate representation of the mix, and not hype bass and treble, which your stereo will do, and will sound more pleasing to your ears. But if you mix this way, with your stereo, exentuating the highs and lows, your mix will sound even moreso on other people's systems, as they exentuate the music even more with their own EQ's and speakers. Monitors are supposed to be relatively flat, so that your mixes will translate accurately to other systems.
You need to get monitors, and you have to decide which ones you like best. I'd guess, some you'd be able to afford would be, tannoy reveal actives,
fostex pm-1,
m-audio sp-5b, yorkville ysm-1p, JBL LSR-25, Yamaha M5(something like that), event ps5's and yamaha ns10. These are all nice monitors and cost from 300 to 500 dollars. If you have more money, there's mackie hr824, event ps8's,
krk v6 or v8, genelecs, dynaudio, beyer sound, and several others. When you get monitors, listen to everything on them, and then you'll get an idea about what your mixes should sound like. If you ONLY listen on your monitors, you will only have that one preference after a while, and it should make mixing accurately easier.
I know I'm not to great at explaining stuff, so if this is at all confusing, someone please help me out.