Astana?
The time of year makes it a tough choice. Caisse d'Epargne would be a strong team & he'd be comfortable, but the delayed Valverde situation probably complicates negotiations. They've got cool uniforms, & ride the new Pinarello Dogma. There are guys who would give everything they have to help Alberto win the Tour.
I like the Quick Step offer of bringing four or five riders along, plus Boonen said he'd be welcome & the manager hasn't been afraid to show his interest. I don't know how happy he'd be. But he'd definitely be the team leader for the Tour.
It would be great for him to receive the benefits of Garmin's technology, Allen Lim's recovery ideas, etc. I just read that Contador is friends with CVV. But it would be tough to walk in as a new team leader, especially if Wiggins wouldn't move on to Sky. Other guys have earned the right to lead in various races.
With the little information available about transfers, I'm going to pick Astana. Noval re-upped out of loyalty. De la Fuente was apparently Alberto's choice. It's tough to abandon guys who signed on to ride with you. There's no competition for leadership. Since there are four teams with riders who can get out of their contracts, Astana could get out the check book & hire a couple of strong riders that weren't available before. There's no Team Time Trial at the Tour, so four or five good climbers should be enough. If he leaves, it would be good to go to Quick Step & take some of the Astana friends along.