Purchased a package through LL for Young Island (Near Petit St Vincent) and loved it so much. Check it out - not as "exclusive" as PSV but beautiful and quiet but with an element of fun. (Tip: try the bread!)
I second Syrene-1's comments. We have sailed in the Grenadines & Tobago Cays and have stayed at Young Island twice. It is a very special resort which still has the hideaway charm of the old Caribbean. They also have a marvellous sail away program that combines a hotel stay with 3 or 4 nights on a 50' private sail boat. I would choose Young Island over Petit St Vincent. My last visit to Young Island was through LL and it was an excellent experience.