That does depend. Maybe 5Mb bandwidth would be adequate, 10 Better, and 25MB...that's going to handle 2 Video downloads and 2 computers easily. That's where I'm at.
I run all four at the same time. As for wired....I'm pretty sure a wired connection is better than wireless. No issues with signal strength. Now, I don't let my router "roll" it's channels. I've set mine to Channel 7 and keep it there. The reason....less neighbors on Channel 7.
If you change your channel on your router, then go to your TV set and have it set up a connection, you see all your neighbors on that channel before you make your connection. If there's 5, you'll see 5 choices besides you on that channel.
I have one neighbor on channel 7. Less sharing, more response.
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Tips are greatly appreciated !