As brought up many times by myself and others, gear doesn't directly correlate to "Professional Quality."
I would first sit down and see if you can figure out what is holding your music quality back.
Personally, though I'm am a music educator, the only pro quality musical ability I have is singing. Though I'm a horn performance major, I'm a good 3rd or 4th chair and I'm adequate as a bass player. I know these shortcomings keep my personal music from being pro quality.
My engineering abilities, however, are very pro quality. No bragging, been told. I don't let my gear hinder my creativity.
I still record multi-track (24-32) projects with a 9 year old G4-dual 450MHz PowerMac, MOTU hardware and Digital Performer.
It does what I need, and other than upgrading to a MacPro for editing, I see no need to change hardware to increase the quality of the products I provide my clients.
So, find out what's holding the music back and start with improving that.
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