Carpets are wonderful.
I have a female coastal mix (mutt). She goes 6.5 feet right now. Coastal carpets, and other species of carpet pythons where males engage in per-mating combat can be the same size or larger than the females. That is written in the book THE COMPLETE CARPET PYTHON
There are not huge differences for the most part. In captivity the females probably end up a touch larger in the end, but I'd say you are not going to be overwhelmed by either male or female.
Display caging is perfect for carpets. Semi to highly arboreal species are well worth setting up.
This is my female.
She is very light bodied right now, but seems to finally be getting some girth. She is a terrible eater and often takes 2 months to gear up for food.
I went with Pro-Line caging. 48" x 24" x 24"
I've not had any issues with handling other than a few bites when she was younger.
If I had another opening here for a snake, I'd get Brisbane Coastal from Nick or a Bredli.
But this girl is great.
Also, Dumerils "ground boa", blood pythons and royal pythons are classed as terrestrial and tend to be less active in my experience. Our royal is boring, but nice to handle.
I highly recommend boa constrictors. They are classed as terrestrial too, but they should be considered semi arboreal IMO. There is so much evidence and footage that they hunt, and rest in the canopy that they are certainly more than terrestrial.
So obviously I have one of those too.
Hope you get what you are after!!