The SAE over the pleco unless its an RNP or BNP.
any plants are fine with those species.
plant keeping isnt cheap, it all depends on how much lighting you have,substrate you are using and what kind of plants you want to have.
three kinds of plants
low,medium and high lighting.
let us know what you want/have we will help you out more.
The more info you give us the more info we can give you.