Buying new sax, any suggestions?

I am a student in highschool and im looking at buying a new saxophone. I've been playing a Keilwerth ST 90 alto for 3 years, this coming 4. I really like my saxophone but its 7 years old and i've had an overhaul and its started to have a few problems here and there. I was wondering if anyone had any suggestions for me, im looking at buying a higher end saxophone with not to much of a switch from my Keilwerth. I like my Keilwerth, I like how it 'feels' and how it sounds. Just browsing I bumped into the Keilwerth SX90R, does anyone know anything about this sax?