Great!
It sounds like you are a settled adult and have an established home situation. Boa Constrictors are wonderful. They are as entertaining as almost any other boa or python and will utilize height and ground spaces.
We all have different likes/interests so deciding can be made easier by doing the research you are now.
VERY FEW boas male or female get huge. Any 8 foot BC (boa constrictor) is on the bigger and of the scale.
I consider my male rather large at 6.5 - 7 feet. He is completely handleable and a joy to keep.
This is not a morph. He is a Barranquilla, Colombia, locality boa. He was produced by Gus Rentfro who is considered a world authority on boa constrictors. I purchased this one from Legacy Reptiles.
Take a look at the colors after a fresh shed and in natural lighting!
There are several subspecies and smaller locals to choose from.
I like my boas a bit larger but not overly huge.
The display a nice mix of terrestrial and semi arboreal behaviors when set up and fed properly.
Start here, buy it and enjoy the read. I'd look this over and focus on something you really want.
https://www.amazon.com/Complete-Boa-.../dp/0978897927