Actually, you're on the right track. The Pentax 67 has a lot going for it. To do what you're considering you need a through the lens focusing camera. The Pentax is the cheapest system out there that does that. And the lenses are awesome. Stear clear of older TLR 6X6 cameras. For action, you need a flash and you need to look through the taking lens and be able to capture the moments. The only downside of the P67 is it's a muscle buider. A possible exception is the Bronica. Some of the older Bronica's are very nice. And smaller.