In reply to Ciderslider: The basic campsite by the Bryn Trych Hotel puts you within easy staggering distance of the hotel bar and meals (good but pricey for North Wales - think home counties gastro pub prices). Pete's cheap and filling, food variable. Best breakfasts to be had at Bryn Glo B & B/Cafe as you enter Capel, not certain if it is open this time of year. PYB good for a drink, not sure about food. Iconic pubs would be the Pen y Gwryd Hotel at the foot of the pass (old school with Everest memorabilia) and the Vaynol Arms in Nant Peris (haunt of the slate head climbing bums of the 80s), bit run down when I last dropped in a few years back.
As others have said you'll want winter gear for Crib Goch and avoid it in high winds. It is a fair bit more challenging than the rest of the horseshoe, the start of the ascent from the col on the Pyg track up to the ridge can be tricky and it is easy to miss the best line, you will be fine though, enjoy.