My opinions
Peppermints - Nice fish, easy to breed but messy & males can be aggressive and spend more time fighting than breeding so don't get sucked into buying a reverse trio
L066 - Nice fish, easy to breed
L333 - Don't like them, over-priced and too common
L134 - Up there with the nicest looking plecos, harder to breed but worth it
If you don't want to grow fry up and pick your breeders (I believe that's the best way) buy proven breeders or sub-adults and not someone elses problems
If you're open to shipping you'll have a lot more to choose from too
Look around at recent prices for similar sized fish.
It's best to pay a little more for quality, well fed & carefully selected bloodlines.
You can buy an ALDI brand TV but it will never be a sony or samsung quality
Hope that helps a little
Nat