Well, I can't get the site to open for the life of me, but I can comment a bit on what the others were trying to tell you.
About the cost of your equipment, it's not a factor; it's what you do with it that counts.
The "low range" that Playit was talking about are the frequency ranges in your eq settings, not where you are playing your instrument at. I am a lefty too, and I don't know what that has to do with where I play....
If you are getting silabance in your recordings, it's because you are singing straight into your mic. Get a pop filter, and try to position the mic so that it is aimed at your chin or the tip of your nose. Also applying a bit of eq in the mixdown will help with some of it, but singing it correctly and a pop filter will go a long way toward reducing it. Silabance is the "sssss" sounds caused by your breath hitting the diaphram in your mic, in case you didn't know...
Listen to your favorite CD and compare it to the way your song sounds. You won't be able to match the volume, but listen to the instruments and vocals and how they compare to what you are doing. Your goal is to match that sound quality in what you produce. I will try to listen to your song when I get home, as my pc has issues with certain sites and offer you a bit more.