For buffalo.. while I've never gone hunting for one, I've seen how big they are. I would think you'd need something in the realm of a .300 win mag or maybe any of them 7mm magnums? For the other two, I'm guessing a .308 or .30-06 should be fine. Anyway, try a Savage. I have two of them myself(one in .223 and in .308). Great rifles for the money. If you wanna be baller, try a Remington M24 :boink: And man, you want a Leupold?! They're great scopes but that's a lot of $$$$. Take a look at the Bushnell Elite 3200 or 4200. I have a 3200 on my .308. Not too expensive. Mine cost around 270.