RE: Which stabilizer?
 

I shoot a Bowtech Liberty with a 28" Posten stab and being a fairly reflexed riser with parellel limbs, I need offset back weight to cure an very aggressing forward roll. My friends Guardian with the same stab on isn't nearly as bad so it really depends on feel to you and overall balance of your bow.

Just something to think about because my bow and your Marquis have similar geometry.