Vibraphone - WTB: 3-oct glockenspiel with damper dampener

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-I'm looking to buy a hi-end glockenspiel that offers the following:

-3.3-octave range (if 3 octaves, at least goes down to C, not just F)

-easily separable or folding frame

-detachable case or extra case included for when I cannot bring the frame with me.

I'm currently looking at the following makers, but none seem to offer all the features above, or I have heard not so good reviews (Adams) or no reviews at all (Korogi). If you have a used instrument or believe you could make a damper/frame system for one of the following, or even have experience playing some of the following and can offer feedback on which to choose, please let me know:

Fall Creek (K100 series or RT series)
Adams roundtops
Korogi glocken
Schiedmayer glock
DeMorrow glock
Deagan parsifals or song bells
Leedy