Upgrade from WR841N to

Hi, Thanks for reading.
My old modem failed and I am currently using a TP Link WR841N router that came free with my modem purchase. It appears to work fine in some areas of the house but leaves quite a few dead spots. I must say for a $20 modem this thing performs very well.

I would like to upgrade the WR841N to a higher performing router in hopes of getting better signal in the current dead spots. I don't need 801.11 AC, from a practical standpoint, a N600 will do fine. But I do...

Upgrade from WR841N to <tbd>