1...Nf6, 1...d5, 1...e6, 1...d6, 1...f5, 1...g6, 1...c5, 1...c6, and perhaps even 1...Nc6, 1...b6, 1...b5, or 1...a6 are all perfectly playable.
I think you need to be more specific about what you're after. In particular, what'd be "suitable" for you?
I was looking for suitable openings against d4 .