Bruisers, or new playstyle?

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I'm at a bit of a cross-roads in who i want to buy next. Ive been mainly playing Volibear lately, or solo top wukong. i love them both but want to start giving more champions a try before i cap out at lvl 30. Im probably more useful with a bruiser type character (such as olaf) over a mage type champion, but i can play every role.
Here's my delimma, should i stick with a bruiser such as Olaf, or pantheon, or switch it up and learn a different, more difficult play style such as Nidalee?
I'd appreciate any feedback. Thanks