The time to upgrade is when your present instrument is holding you back. That would be when you can play the one you've got.
Almost the same goes about the mouthpiece.
I prefer a good mouthpiece on an average instrument than a bad mouthpiece on a top horn.
YSS475 does not drive me crazy.
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A huge collection of tutorials & guides in PDF format. Over 80 backing tracks (mp3). Free when you order books, DVDs or CDs