Newbie commercial school question

This summer I will fulfill a lifelong dream to learn to fly sailplanes.
I would like to concentrate the first phase of my schooling into a
concentrated 7 or 10 day period. I'd like to find a commercial flight
school in an area of stable and predictable weather. After browsing
this list, I also wonder if training would be more intensive in a
powered glider. Can anyone comment on the above? Recommend a specific
program, school, or teacher? Am I off base on the powered option? If I
am on base, recommend a school so equipped?

I live in NY but can travel anywhere in US for this plan.

Thanks.