I have a Garmin Oregon 450, touchscreen which works with a gloved hand unlike smartphones (unless you have texting gloves).
I have the Upper Midwest Fishing Guide maps witch gives you contours on most lakes in ND, MN, SD, IA, WI, IL, & MI. Has over 500 lakes with highly defined contours including public acces points, hazards, etc.
I also have purchased the City Navigator North Amertica, & also have downloaded free topo maps for MN & ND, also snowmobile trail maps for both.
You can go into map settings & enable or disable any combo of maps you want to eliminate some of unwanted clutter by designating only the maps you need for your needs at any particular time.
The best way to do all this without having to switch chips all the time is to buy a 16g (which is what I have) micro sd card or you can go 8g if you want but I put the 16 in so I will have plenty of room for adding things to it.
When you get your maps you are goin to want to get them on DVD-ROM so you can load them to your blank card in gps.
If you go to gpscity on the web they have many videos on how to use & decide on a certain gps.
They just happen to be where I got mine.
Good luck on your decision. I hope I helped & didn’t confuse you in making your decision.
It took me a while to figure out which one to go with, since it was going to be my first handheld, but I am very happy with my oregon 450.
If you think you want a bigger screen then go to the montana.
from what i hear the etrex is a good unit also only thing is I think the oregon does a little more than the etrex.
the oregon does like batteries but 2 AA lithiums last a few days of constant use. I am think of going with rechargeables.