Yes, Definitely chose your bike before the helmet exactly for what you pointed out. Riding position. The Monster is a somewhere half way between MTB and Road bike. Ducati V2 are have a lot of torque, meaning, a little gas gives you a lot of jerking acceleration. Rain mode, smooths it out a lot. I haven't ridden a 2018 Monster. They've smoothed them out from what I understand. The clutch springs used to be really tough, now it's nothing as difficult. So newer ones are easier than older ones. Price? I don't know. Check out Kelly Blue Book, they usually sell them at a median price. There are a lot of things only you can evaluate as we are all guessing about what you are capable of. But if you ask me, you have to get something you love, you feel for, you really want to ride. You'll get good at it if... you're not a maniac and don't kill yourself, if you're capable, if, if. You'll learn and then you'll see.
Basic standard theory is to get a thrasher that costs nothing, that you won't feel bad if it falls over. Try it 6 months. Then get something pretty. Some people just get the pretty bike and do well. Others get the pretty bike and trash it 16 times before they learn. That's all up to you. Almost everyone drops their first bike a few times and bangs up the sides in a parking lot going 0 MPH. It's not the end of the world, but if it's a Ducati it'll be expensive. So IMHO, Monster is great if you can handle it. Commitment, study all that.
btw, Most sales guys will tell you what they are supposed to push that week. No one knows what you want except you, nor how much you can spend and all that.