You can take the TV but if you want the Virgin phone line you'll have to pay for that ontop of your BT phoneline and Orange BB.
Personally I'd stick with the BT line and Orange and then take the telly you like.
Don't forget to shop around - Sky may have the package you want for the a better price.
Either way - Quidco are paying cashback on both Sky and Virgin.
http://www.quidco.com/virgin-media/
http://www.quidco.com/skydigital/
Virgin: £55 (cable)
Sky: £130