I'm not familiar with Sugarmill, but I am familiar with the hotels in Rodney Bay St. Lucia. If no one can help you out, let me know what you're looking for in the hotel and I could suggest a few places from anywhere between $50-$300+ a night.

Drink all day at home, your friends worry about you; do it on vacation and they say "what a good time you're having". Save your friends needless worry, travel more!