CARL0S2VT Very insightful
As for your question, I know for a fact FortuneJack.com offers what you're looking for, a lot of Slot variants if you're into that. Crypto-games.net also offers one version of slots which is more simplistic. Both of them are legit, you have my word on that.
If you want to check a casino's reliability, check the site's history (How long has it been up? has it been paying its customers without fail during its lifetime? Is it provably fair?) These are just the first things you should check, IMO.