To make all of this to work correctly and to get the fastest speeds...
1. Coax Cable Modem
2. Wired Router
3. Wired 5,8,16,24 Switch with 1-2MB Buffer
4. Wireless Router/Access Point AP would be used (1st floor)
5 Wireless Router/Access Point AP would be use (2nd floor)
6. Wireless Bridge (anywhere you want to make a device wireless)
I've tested the above my ISP just increase my speed from 15MB to 30MB range avg speed is 28MB download and 8MB upload rated..
Mix bag of wired desktops, wireless desktop, wireless laptops you name it. LAN is quick the WAN is very fast. I do a lot of remote control here even on my wireless laptop the two AP are set to 100% power and are placed at corner window area. Coverage is excellent. I also stream audio and video wireless and wired to media boxes connected to the TV over network. I can download huge files watch huge video files still able to do things with out network lag.
If done right anyone can do it...
As to say wired is faster than wireless well almost equal but I still I use to use a Wired Router which is very quick to control the house. I did try it with the Wireless Router/Access Points you really can't download quick if I use as Access Point then I can.