I'm looking for one that is around 60-80+ pounds
That is quite light. Don't you want leftovers? I'd go for a 100 lbs. Seriously, this is going to be good meat, especially for the effort you will be putting into it. Don't want anyone going hungry.
( Barbados, Katahdin and white face wool...
We just roasted a 1 1/2 yo ewe on the fire pit last weekend. 150 lb live weight, ~75 lb. dressed, and ~30 lbs. cooked. Applied a marinade of olive oil, butter, rosemary, salt, pepper, and most importantly, garlic and lots of it. Terrific! I've never tried a lamb before because the market is...