I have the Garmin Rino 655T, and used it in Idaho this past fall and loved it. It is basically like the Montana, but has a smaller touch screen as a trade off for the radio features of the Rino. I really like the radio features since others in my party have Rinos too. You can see and update their position on your gps's map and track them as long as you have radio contact. It also has a weather radio and map on it too. It was nice to here updates about the fires in Idaho this past September when smoke rolled into our basin.
I don't like to use the chips by Garmin as they are only viewable on your device. I like to look at my maps before I go out and add data to them if needed or highlight features. Plus some states are on different Garmin SD cards, for example, I hunt whitetails in Indiana and Ohio, and since they are on different micro SD cards, I need to switch them out when I switch states. Idaho, Montana, and Wyoming are on different cards from Colorado, Utah, New Mex, and Arizona. The maps that come from Garmin that have all the states, Topo US, is only 1:100,000 detail. Not much good for hunting in my opinion. I have it, and it was a waste of money. I'm not sure how the maps come from huntinggpsmaps.com come, but I'm pretty sure you can look at theirs on the computer prior to using it on the gps. Sounds like a good product. You can download many states at gpsfiledepot.com for free. It's all I use anymore. They are usually more detailed than Garmins and often create by individuals whop are using them. I have several with land usage included on them. I load all the maps I will use for the year once in the summer and leave it alone until the next season.
The cameras are a nice feature, not the quality you can get out of a point and shoot, but they show up on the Basecamp software, as a picture with co-ordinances. I took pictures of wallows I found, and then stored them as way points for future use. Worth the extra $$ if it is in your budget.
