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.