We have Sky for TV, phone and BB but because of where we live, the freebies don't apply. Sky is our only option as Virgin laugh when we ask how long before they cable our area and we like to keep everything together. Remember though with Sky you own the box etc so any problems you're liable to get a big bill.
We have Sky tv and Broadband and are happy with it. As far as costs of replacements go- we have Sky Protect @ £8.50 a month we just had our old router replaced through this so no extra cost.
I have free broadband until next year because I have Sky Sports package all ok they usually have offers so give them a try at least you get to speak to an advisor unlike BT which sends you around the world!