Bebop, and especially bossa, I'd shoot for a G70 or E60. For a start off I am going to assume you play piano. So a 76 is a must. Secondly, if you play piano, I am going to assume you want a GOOD one... again, G70/E60

But bottom line is audition everything yourself, if you can...

One man's Dizzy is another man's Miles
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An arranger is just a tool. What matters is what you build with it..!