I've always set my opponents to random (not intelligence though), and usually ended up with 7-8 races plus minor races. Now I've got two races for opponents the game gave me and it's incredibly much easier. What's a good opponents setting to balance out the game for an average player who doesn't take notes while playing?

Maybe I've been beating myself up for naught. The only victory I've had is a Tech Victory and I've turned that off now but I guess I did have to stay alive long enough. The game I'm in now with two opponents should lead quickly to a conquest victory (Normal difficulty) with 88 percent of the galaxy.
Curious how some of you are setting up opponents, never thought about it much other than randomizing it. BTW, I also turn off Mega Events and do Blind Exploration.
thanks.