I have replaced ABS with PET+. There are several good discussions here talking about it. It's as easy to print, warps less and is a really good material.

It's a little more expensive but that's relative. Even the most expensive filament in reality is inexpensive since most parts cost us pennies. And, you can't smooth PET+ with acetone. It sounds like I have more bad things to say about PET+ than good things but I just wanted to let you know how they differ.

I really like the quality and results I get with PET+ over ABS. I've never had any luck getting PLA to print well. I'm sure it's me, but I just don't like it. Anyone that sells PLA as a "green" alternative is misleading you a bit. It still takes PLA dozens if not hundreds of years to breakdown in a landfill.