In reply to Harry The Owl:
well it sounds like you'll have a good time wherever you go. looking at how things are, there's lots of fresh snow in the cairngorms, so you can dig around in the white stuff plenty there, but if it's very powdery snow holes might not be great - although if it's windblown they might be fine. there's hardly any new snow on ben nevis, so you'll have to find some old snowbanks for snow holing.
having said all that, it sounds like you're keen to do some longish, easyish routes as well as digging holes. the long routes in the 'gorms all have long walk-ins which would be murderous in the fresh snow. the ben probably has everything you could want for a first trip and it's a very impressive place. ledge route is very straightforward and as long as there isn't too much fresh snow the easy gullies should remain safe - check the avalanche forecasts. all in all quite an alpine experience - sounds like LOTS of people have been enjoying themselves up there in the last fortnight.
have fun, wish I was going up.