I will offer some advice on Kindles, the 7" Fire is good for surfing the net and such, but I have found that the Amazon operating system on mine (Silk OS) stopped supporting Flash Player several updates back, which causes a LOT of glitchy performance on videos like youtube.
Amazon will randomly update systems without warning or the option to refuse to update. You just turn on your kindle and if you are connected to wifi, it will update without you even knowing about it. You also can't roll back to an earlier version once updated.
I ordered a $30 RCA 7" tablet from walmart back at Thanksgiving and I use it to watch youtube music videos in bed.