I picked up a 6 tpi Spear and Jackson in lovely condition on Ebay, I was surprised no one else bid on it. It cuts easily and suits me just fine. The only time I needed something more aggressive was ripping up some logs that were not quite dry, but a chain saw got them down to manageable sizes.
I wouldn’t worry too much about tpi. Reshaping large teeth is easy because the spacing is easy to get right. I redid my new s&j to have ~5 tpi (size of 5mm) and don’t regret it. It took time but it was very easy.
I’d just look for a saw with a nice plate, usable handle and the length you want. Then just file the teeth away if necessary.