Without re-reading that myself....here's what I can summarize for 'ya.
St. Lucia is awesome and I think you made the right choice. We chose St. Lucia in '03 as our first Caribbean destination, having never explored that part of the world before and we chose it because it seemed like the most lush, tropical, 'paradisey' of all the islands.
And I love Kauai so it seemed like something similar but more exotic/different.
Two years back, we visited St. John (USVI) and took a day dive trip hitting parts of the BVI. From what we heard from folks who have been to the BVI, the USVI are much better, although the BVI have some spots that are definitely worth hitting, like this one we LOVED:
http://www.williamthornton.com/ . St. John is AWESOME btw.
St. Lucia was just what the doctor ordered & you'll find out that we actually had our stay on the island split between Sandals & Anse Chastenet:
http://www.ansechastanet.com/ and liked Sandals so much that we ended up canceling our reservation at Anse Chastanet.
Now, I kinda would have liked checking out Anse Chastanet but Sandals was great. We have friends who are getting married in Aruba in June and actually planning on staying at Anse Chastanet for their honeymoon. The place is one of the most romantic boutique hotels in the world, according to Travel & Leisure magazine or something like that. And I think they do offer an all-inclusive package, I'm not sure. The place seems amazing but there are some drawbacks...while only three walls seems cool with the incredible view dropping out before you where the 4th wall would be, I've heard the bugs (and noise from the treefrogs & such) can be a little overbearing at times. Depends on how tough yer girl is....
You certainly won't be disappointed with St. Lucia, that's for sure.
The Sandals Grand was great and you could visit the other 2 Sandals properties on the island to eat or hang out. At the time, the Grand was the newest.
Leading up to booking Sandals, we had heard good things & bad things....and only knew folks personally who had been to Sandals in Jamaica and loved it. So we pulled the trigger and ended up really enjoying ourselves. As we told our friends who are honeymooning on the island in June, it's no Ritz Carlton but it's perfectly nice, comfortable, clean and a ton of fun, with great food & drinks (while I read some reviews about the food not being good....we were really quite pleased).
What else can I tell 'ya?