PS3 will do all the streaming work. PlayTV is great, but pretty fiddly to switch on TV as you need to switch on TV, then PS3, then run playtv as if it were a game for it to load.

Get the cheapest PS3 you can buy, and buy a 1TB notebook drive, swap them out to do your recording as you cant record to external USB with playTV or any other device.

To give you an idea, an hour and a half of sport = 20GB recording.

As suggested, build/buy PC to help with the CCTV, or go with a webcam/free recroding program such as yawcam.

All depends on budget.