I want a new snake and i need a lot of ideas.

that's a very tough choice coz the species you indicated are all "dream snakes" for me!

If you want a red tail boa, make sure that it's from a bloodline that's bound to stay "smaller" than the larger bloodlines; they're meant to be the "beginner's big snake" afterall.

I see that you already have 4 ball pythons; since you mentioned that you've
bloods/short-tails, how about a sand boa?

They're not so common (giving you that "I'm unique" feeling. Trust me...they're probably only 5 of us in the Philippines who own afrocks!). Not so large. Not so expensive. Although not so visible at times (as they love to burrow), I still think they're cool snakes for pets (my only frustration is that here in Manila, they're priced MUCH higher than albino burm hatchlings).