It would not be anything all that special since you are sitting right on top of the router. Buy from a well known company like tplink,asus,netgear etc to be sure you get good support. I would look for dual band routers that use the 600m number. It will be the most cost effective since you are being limited by your end devices and the connection back to the main camp. If price is a real issue then look at single band routers that use 300m.
Most differences in routers is features in the software so you have to look and decide if one router has feature you need and other do not. Read the online manuals before you buy so you can see which you like better.