Get Jax, he is considered op if you're into that, he is good at escaping, due to counter strike, good stun, can dodge attack, can kill, and can take down towers with ease

Master Yi and Tryndamere are great picks. Try searching up builds from Mobafire.com. Personally, I don't think you should buy Xerath and Brand unless you are skilled and willing to practice. I use Xerath and I refunded him because he had less utility. My bro uses Brand and got lot's of deaths. In all the Brand's that I fought against, they are struggling.

It's your choice though. I'm just telling you my experience with Xerath and Brand.