They are cheap because they are a simple device. I think a four port 10/100 base-T switch is now just a single chip. For most people even a cheap switch like this is overkill and a simple hub would work as well. but with sweitches being so cheap these is nothing to be saved by getting a hub. Just get one from D-link, lynksys, netgear or the like.
I'd agree. They've all gone to SoC (System on a Chip), so just because it's small and light weight, doesn't mean junk. The three manufacturers ChrisA listed are usually quite reliable.
The problem with that is my current network is hardwired into the house (done before gigabit ethernet was common) and the house has just been decorated. I'd have to make quite a few sacrifices to rewire the network now (like my life
).
Still, thinking of the future is not a bad idea.
Since you already have wire run, it's much easier to upgrade it. Attach Cat6 to the old stuff, and pull it through. Then terminate the new wire. That's the hard part.
If you aren't willing to run wire, or have it done, you may want to go wireless. Depending on the cable lengths and if you can DIY the cabling and termination,
this may be your best option. Not bad at $150USD. Keep in mind though, each device will require interface components. The XBox360 may be a problem. You may be able to combine
this(Ethernet to USB device) and
this(USB WiFi). (The XBox wouldn't operate at Gigabit speeds(100Mbps though), and will drop the speed on the other devices IIRC).
By the time you add it up, rewiring may yet be less expensive. Sorry I can't be more specific, but I don't quite understand the physical installation well enough.
Sorry I can't be of more help.