The only thing is I wish they could be litter trained
one of my guinea pigs is litter trained lol but then he also lives with a litter trained rabbit..non of the pigs I have ever had that have not lived with my rabbit have been litter trained.

that said my favorite on that list is hands down, Gerbils. I have raised them since I was 8 years old, and I cant live without em around, currently I have one elderly boy, he is 6 years old, he is not looking so go anymore though, he's going blind and such..not thats its suprising, the average lifespan is like 3 years old.