Bullfrog is a pretty decent spa. I personally don't like the jet packs. I think they are gimmicky. I've yet to meet someone who really buys more than the packs they need when they buy the spa.
Saratoga are pretty decent spas as well. They are built up your way. I've not been around them a lot. I've really never heard complaints on them.
Not too familiar with Pinnacle. They are built by Premium Leisure. I know PL has hired some good folks to try to get their business turned around so I hate to say too much negative, but as we speak today, there are many better brands out there.
Being in New England, you should be able to find a dealer for most of the top brands.
My personal opinion top brands in no order are: Jacuzzi, Sundance, Caldera, Hot Spring, Marquis, Dimension One. All manufacturers will have a 5-6 person spa with no loungers.
What part of New England are you in? We all know dealers up there and can help steer you to some of the good ones.
Good luck in your search. Be sure to wet test your spa before you buy. That is rule number one on the forum. Don't buy before you try.