Congrats! 
The information above Azza's post is now incorrect after sky changed the pricing, you now only need to pay the one fee for HD regardless of how many HD boxes there are on the subscription.
You can either pay Sky the full whack for a new box, or keep pushing and they knock it down to £40 for the box and £60 "installation fee", if the box is for a simple upgrade to HD for a casually used device you can pick up a second hand box off ebay for £40-£60 then ring them up and ask them to pair the box to the card.

The information above Azza's post is now incorrect after sky changed the pricing, you now only need to pay the one fee for HD regardless of how many HD boxes there are on the subscription.
You can either pay Sky the full whack for a new box, or keep pushing and they knock it down to £40 for the box and £60 "installation fee", if the box is for a simple upgrade to HD for a casually used device you can pick up a second hand box off ebay for £40-£60 then ring them up and ask them to pair the box to the card.
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