Definately stop breaking with your play cue - it is a shot you are using tonnes of power on and i wouldnt want to use a good play cue for them. Plus a good breaker has little throw (flex) and most modern ones use phenolic tips.
http://www.mcdermottcue.com/Sledgehammer.asp
Sledgehammers are the standard as far as im aware but generally not cheap. If you want just use a club cue to break off or cheap crappy cue you get in a supermarket, but investing a breaker is a solid step in the right direction if you wanna take the game seriously.
As for play cues,
http://www.meuccicues.com/ is supposed to be a good brand - same goes for
http://www.stealthcues.com/
Ultimately id recommend finding somewhere you can try them out (never buy on blind over the internet even if its recommended highly) and see what fits your stroke best.