Well man I have a diamond marquis as well And i like the octane 7" hunter stabilizer with the g5 meta peep 3/16" and a g5 sight and a QAD pro drop away. Makes for a nice fast quiet set up. And the sights sweet. Easy adjust pics and a rheostat purple led light. Sweet setup.
Depending on your budget, i'd probably put a viper pro sight with .019 pins, a doinker chubby hunter stabilizer, and a quality drop away or whisker biscuit.
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Dear, Mr. Trophy Hunter - I just shot the buck you passed up.
Proud member of the Quality Deer Mis-Management Association