I wish I still had my fish! All I've ever had are goldfish, though. Bettas sound cool! :) Someday I want to get a big fish tank.
Bettas are by far the best, easiest and nicest-looking fish to get! Not to mention, inexpensive to buy! :-)
Like goldfish, the don't need a filter, etc. Just a small bowl and change the water once a week. They are hardy fish too. They don't die easy like goldfish do. Their only drawback is they must be kept separate or they will fight to the death.
I started with Bettas, then got a 10 gallon, then a 20 gallon and I soon regretted it because it's a LOT of work to keep freshwater fish. I'm back to Bettas. I have four.