Cross box has to come.

Hello dear community! I want to buy a cross machine but have no idea at all what I should pay attention to when buying and don’t really know what kind of one. But I’m sure it should be a 2 measure because of the low maintenance costs. And they go off already more.. I’m in doubt if 125 or 250…. 125er I’ve driven before but the piston was already very low (no dolle compression when kicking and came very late the power thrust but has fun gem 8…). 250ers I have not yet driven…. but a 520KTM and a 620s of yamaha hardenduro both 4stroke the ktm was already a bit brutal but yamaha didn’t even come up in the front in the 2nd full gas…. to my size I am 1.83 and weigh 90~ KG I would spend for the purchase of the baby 2000-250€. I also don’t need any with roads permission that is stupid in my case I drive only forest and field but can you help me with your sure experiences… o one thing I know now already 4stroke will be too expensive for me am erlehrling ^^