How good does sky hd actually look, is it proper hd like hd-dvds and tv series like 24, or just upscaled sharpened sd video? How many hd channels are there? And can you get sky hd at just £25 a month with the normal £15 sub + £10 hd sub? Also is it possible to decline to have it installed so you can do it yourself for free? I don't like the idea of paying £60 just for someone to come and connect the power and hdmi cable to the box.