What are you using it for? Racing or casual play? I think that will make it easier for the guys to recommend something.
For casual use I'd recommend the Hobbywing EZ-Run series, very good cost-performance combo for getting into brushless.
For racing, I use the Hobbywing XE-Run 120A, also very good performance for the money you pay. And I really like the convenience of the programming card, no need for a laptop like the Tekin RS, which I also used to own.