General:
* Assortment of meats
* Selection of meats
* Variety of meats
Specific:
* Cuts of meat (for different types of meat)
* Carcass (for whole animals)
* Butcher's block (for meat displayed for sale)
* Feast of meats (for a large, special meal)
You could also be creative and use descriptive phrases:
* A symphony of flavors (if you're talking about a variety of meats for a specific dish)
* A carnivore's delight (if you're talking about a large selection of meats)
Ultimately, the best collective noun depends on what you're trying to convey.