We did Switzerland February half term last year for a family of 4 for £1700 all in. This included travel (by car so ferry/tolls/fuel), accomodation (an Appartment), lift passes, food (we self cater, but go outlunchtimes) and spending money. We do have our own skis/boards.
For two the travel would work out more expensive and you may as well fly.
For next February (week before half term) we have booked an Appartment in morzine. Spacious and close to the lift/shops etc. works out about £130 per person.
So you would ad £100 flight, £70 transfer, £170 ish lift pass. You would be a little over with hire and spending money. You would get a lot more skiing and boarding done though!
I have also seen some great coach deals to brides-les-bains (near maribel). We did consider this for just me and the hubby last Easter, but could not really justify another holiday. I have heard great things about this place, lower resort but 20 mins in the gondola and you are in maribel.