Still deciding huh? I've heard some wonderful things about Windjammer. If I was going with a resort, that's probably where I would go. I believe Paula Dean from the Food Network did a special from St Lucia and she stayed at Windjammer. Maybe you could check that out.
FI and I went to St Lucia last October and just fell in love with it. We stayed at Coconut Bay which is on the Atlantic side (not the beautiful Caribbean beaches you get on the Caribbean side) but we knew this going into it and got a good deal. We got to explore the island a little bit so we saw different areas.
The island is absolutely gorgeous. It's so lush, so between that and the beaches, you really have the best of both worlds. And the locals are very friendly. Chris and I are so excited to take our friends and family (about 40 people) there because none of them have ever been there and they are just going to love it. Unfortunately the flights are a bit expense, but St Lucia is worth it!
Let me know if you have any more questions. I would be happy to answer for you as I have done TONS of research on the island. I'm obsessed! Also, Tripadvisor is a great forum to check out.
I'm excited there's another (possible) St Lucia bride!