That really depends on what you're looking for in a snake.
Are you looking for something that typically handles well and you'll handle often? Or Are you looking for more of a display snake?
How about size of snake? I see you mentioned a green anaconda, so I'm guessing you want to go bigger...
To answer that...I would definitely not jump straight from a BP to a conda, especially a green. That's way too much snake for one person. Another thing to consider is they require very large enclosures with a huge water pool because they spend a lot of time in the water. Feeding them isn't cheap either.
I say look into different boas (red tails, BCIs and rainbows), blood and short-tail pythons, carpet pythons, dwarf retics, if you want something with more size that handles well.
If you're into the more slender snakes and want to stay under 5 feet I always say go for a King.
If you're thinking more of a display snake look into GTPs or ETBs.
It's really going to come down to what YOU want. Do some research, narrow it down, ask follow up questions and you'll find the right snake for you