I still mix things up. (I do very much like the Caro-Kann though, on both sides.) But I've heard some chess teachers say it's better to stick to a small repertoire that suits you, just like magicians say it's better to know ten tricks very well than a hundred tricks. I think Tigran Petrosian played the Caro-Kann a lot as black. And I remember it was a favorite of Yasser Seirawan, who also played the Queen's Gambit a lot as White. Can't remember any Slav players off the top of my head. But I think the best way to learn an opening is to study games from a player you admire who used the opening a lot. It's probably good to stick to what you know for a while and get good at it. You can always experiment later on, but if you're looking for good results, there is magic in mastering one thing.
An opening repetoire to save the day
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I started using a specific opening about 2 months ago. At first I didn't do to well. Slowly my game started to get better; 1. I was becoming more comfortable with the positions I saw. 2. I did not get such stage fright. What do i play when they play ... ? Does this sound familiar to anyone? I play Queen's Gambit as white. And try to play Caro-Kann or Slav as black. What do you play?