300cm probe is pretty ideal for most places. I think mine is a 265 so I should be one to talk. Though the next one I buy is going to be a 300cm probe.
BD, G3, Ortovox all make probes I like. I like ones that are pull and lock. The screw down ones are alright, but I find them more time consuming than they need to be considering the circumstance you might be using it for.
Yea forget about the old screw in models, killclimz will be messaging you about the Pieps from Patroller too hope to buy in the next couple weeks.