How far are you throwing the Destroyer? Majority of people will probably say it's too fast for you. High speed discs can mask form flaws.
Beast and Roadrunner are a great combo for newer players. I would use either as your main long distance drivers. Maybe add a Wraith for windy conditions.
Concentrate on learning the Teebird and Leopard for most drives though. Teebird as stable to OS driver and Leopard as stable to US. Maybe add a Pro Leopard as they are cheap and fly more true to a Leopards numbers.
Champ Roc3 will work great as your stable to OS mid. Pro D Buzzz's are great as they're neutral flyers, but it will beat in quickly. I would consider finding a neutral to slightly US mid in higher grade plastic.
Can't go wrong with Wizards, but you should get one or two more to use for approach shots and drives. Save one, or even better two, just for putting. Most people carry two of their putters just for putts and two (or more) just for throwing.
Otherwise solid bag. Once you keep improving I would also add an OS control/utility disc like a Firebird or Banshee.