Dolomites, where to stay?

I have been booking all my own ski breaks myself and not used the tour operators for a good number of years as I usually go for short breaks. This year I plan to go for a week and was just going to book a weeks package. The problem I have is we all want to go to the Dolomites and none of the travel companies go there from Ireland.
I can organise flights and transfers easily but that's where I run out of luck.
I have been reading everyone's reports but so far have come up with very little ideas on accommodation. Is there anywhere that someone can recommend that they might have stayed?
What I am looking for is any kind of accommodation for 4 or 6 of us in twin rooms preferably in Arabba or Selva but am open to suggestion.

Thanks

I wouldn't rule out staying elsewhere on the circuit. Reason I say that is Selva and Arraba are on opposite sides if the circuit, staying in one it takes a while to get to the other limiting skiing time once you get there. Stay in one of the resorts halfway between both are easily accessible.

Skiworld have added the Sella Ronda to there tailor-made section for this season. Worth getting in contact with them. http://www.skiworld.co.uk/ski-resorts/italy-ski-holidays

Collett's Mountain Holidays, can't recommend them highly enough. They have accommodation in Arabba, Corvara and Pedraces and if you can get flights to Venice or Treviso transfer is included (or can also transfer from Innsbruck for a fee). Can book chalet board or self catering in all villages. We have been using them for years and going again in January. It's a beautiful area, enjoy!

Thanks for the ideas. Collett's Mountain Holidays looks perfect for us.

Have done self organised to Arraba, as a stopping off point in a European tour. Had several offers of accommodation.

Have stayed elsewhere in the Dolomites, both on a b&b, and HB basis booked directly.

Mountainsunltd.com have a slope side chalet in San Cassiano and another property in Kronplatz (la Villa is the closest town on the circuit that is reachable from here). They do pick ups from either Innsbruck , Venice and Treviso. Been with them several times and always found them very helpful.