All the boxes and sticks listed below should work great for you. I always recommend at least 2gb of RAM on any device and at least a quad core CPU. Currently the top devices are using the RK3328 and RK3399 chipsets.
While our links point to GearBest for the deals, you are free to shop around and find the best deal for you. Do keep in mind, if ordering from GearBest it could take longer to arrive if not coming from a US warehouse.
I do not recommend buying any device that is already fully loaded from a website. You never truly know what you are getting with those, unless you can speak directly with the person who is loading them (like me in the cases where local people buy from me).