PS to the OP: Tower Ridge in winter is good with a lightish rack and a single 70-metre rope so you can string it out and run light and fast over the easy stuff, but double it up and do 35-metre pitches with (as it were) 2 ropes if the climbing turns tricksy on you, as it definitely can (esp. in powder, esp. between the Eastern Traverse and the top of the Great Tower). Take some slings you don't mind never seeing again, and don't bother with screws unless it's late season and there really has been loads of freeze-thaw (as there has this winter). Move as fast as possible, don't let yourselves get stuck behind other parties, take spare headtorches with new batteries, and memorise how to get off the plateau before you set off.
Oh, and don't believe people who tell you you can't retreat off Tower Ridge if you need to. Of course you can. Just wave goodbye to one of those slings I was talking about, and rap off into Observatory Gully wherever it looks okay. (Taking the usual care about setting up the belay, and about not abseiling onto dodgy windslab etc. etc.) Once again, a long rope is your friend here.
Above all, enjoy it. In normal conditions it isn't terribly taxing, but in any conditions it is a long and marvellous adventure that, once you've done, you will always dream of repeating
Post edited at 22:09