Which 2buy 2watch videos?

[D L Davis]

Am thinking of buying an inexpensive ($400 or under) Lenovo tablet (not phone) with touch screen simply to watch how-to videos on youtube and to watch continuing education videos from home via my wireless router. I'd prefer windows 7, not 10 or chrome. I'd also want it to accept sdram cards. It doesn't have to have a cdrom, as I have a usb one. Recommendations?