Hello, here is link to
Digikey catalog excerpt for switches. It's almost all technical info/specs. There are some pictures. In that mess somewhere I found a switch to put in my Q3 for two levels. It just took me about 30 minutes to find it.
I think it's just a matter of defining your needs. You said pushbutton so that's one. Latching, momentary, combination of both, normally open, normally closed, travel distance of button, tension or feel of button, tactile(clicking) or smooth action.
Sorry I'm rambling...
Good luck, I'll be watching so I can help out if I can.