In reply to sweenyt:
My Media centre is my desktop computer with a dual channel TV card inside it, something like this one.
http://www.amazon.co.uk/Kworld-PlusTV-PE355-2T-Express-Remote/dp/B00368CT34...
Mine is a few years old and has never failed me yet.
I simply plug a TV cable, from the roof, into the computer and then plug my computer into my TV with a HDMI cable. This means that either your computer has a HDMI port or you buy a cheap Graphics's card with a HDMI port.
My computer runs Window's 7 and I use the bog standard Window's Media Centre for everything. I let it automatically tune all the available TV and Radio stations that I can receive in my area and let the automatic programmer tell me what is available over the next two weeks.
With a dual channel TV card I can record two shows together, or record one show and record another or any combination that takes my fancy. I can choose to record one show or set the Media Centre to record an entire series.
I can pause Live TV or Live radio and come back to it when the interruption has been told to fek off.
The Media Centre can also play music, movies or show photos. Personally I use the Window's Media Centre for TV and Radio 2. I use either VLC or Window's Media Player, not to be confused with Media Centre, to watch my downloaded movies and TV shows.
The only down side to using my desktop is the drone of the computer fans but you could build a fan-less, or almost fan-less silent computer. The drone of the fans is drowned out by movies anyway and I've had this set-up for years so I have tuned out the fan noise.
Any computer will work as a media centre provided you have a TV card and a graphics card with HDMI ports. You'll need a big hard drive to record the TV and collect movies.
Rather than trying to control my media centre from the sofa with a wireless mouse I use either my Tablet or smart-phone to control everything as touch-pad mouse and keyboard. It takes all of 5 minutes to set up and works perfectly every time.
https://play.google.com/store/apps/details?id=org.gmote.client.android
Another option, which is totally silent and can be made on a shoestring is, what I have at work. I have a Raspberry Pi duct-taped to an external hard drive which is full of movies and TV shows. This is then plugged into the HDMI slot of the TV. This is then controlled with a wireless mouse. I would use gmote but there is no wifi access at work, and the mouse works perfectly well.
Raspberry Pi £32-80
http://cpc.farnell.com/jsp/search/productdetail.jsp?sku=SC12831
SD Card (Must be Class 10 for best results) £7-45
Wifi Dongle £8-39
http://cpc.farnell.com/element14/wipi/dongle-wifi-usb-for-raspberry-pi/dp/S...
External hard drive, either going spare or your choice of cost
Wireless mouse, either going spare or your choice
HDMI full-size cable scrounged
Micro USB phone charger scrounged
Raspberry Pi XBMC software
http://wiki.xbmc.org/?title=Raspberry_Pi
Post edited at 20:48