Jules54,
I just begin timesharing last year and I am beginning to be like you. In this short time I compiled 5 $7,000 including closing costs, sold one last week, and bought another just 30 minutes ago, and I have not yet spent a single night in any timeshare!!!.....This is truly a disease....

I do have fabulous reservation through exchanges already with Sheraton in Xmas, HGVC in NY, and Grand Mayan in March....

Totally addicting.
Personally, I would not buy Antigua, because air is expensive, and I don't see myself going there every year. I also don't see it as a location that can grow with my family. I think a timeshare in U.S. is ideal, you can use it yourself and your growing family, and trade when you want to go Mexico, Hawaii, or Caribbean.
I guess the first thing the op has to learn is the different resorts, clubs, point systems available out there. I have been on Tug for more than 6 months reading it almost every day and I am still learning...
The second thing the op has to learn is how to exchange and trade. I am one of those that totally avoided RCI and exchanged with SFX and I find them fulfilling my every vacation dream.
Keep researching and don't limit yourself. Sign up with TUG and read the reviews, explore other timeshare sale websites that you will come across from reading TUG.
Good luck!