Discussions

I have a 6-year-old boy who has some major attitude. He is obnoxious, impulsive and, well, annoying a good majority of the time. He gets into trouble at school for this, on his sports team (from his coaches) for this, at home and when he's over at his friend's house. So clearly he is exhibiting these behaviours all around. I am wondering if anyone has any advice on how to get through to him that enough is enough. He doesn't respect other ppl's personal space and will roll his eyes, stick out his tongue, etc. when he is spoken to by any authoritative figure. (He told his coach to shut up twice yesterday). He lies, even when he knows he's been out and out caught, he will still lie and manipulate things. In the end, when he feels that he can't get out of it, he'll throw a full-out melt down, screaming, crying and kicking anything in sight. He is way to heavy for me to haul him up to his room and he is very obstinate, and won't go willingly. So we get to sit and listen to his melt down until he decides to be finished.  
His defiance has me at the end of my rope. To my knowledge, there is no one in Brandon who specializes in child behaviour such as this (and his pediatrician is out of the question).  
I am not looking for a diagnosis of any sort, just hoping some one has any suggestions on some consequences for his actions/behaviours. I have tried so much, and it works for the moment, but he has yet to learn from them. This kind of tells me that the consequences aren't serious enough. I am so frustrated and at my wits end. His 9 year old brother has had enough and soon he's going to be the kid that everyone avoids b/c of his aweful behaviours. Either that or he's going to be the kid who gets into serious trouble b/c he's so defiant.  
Either way, I need to nip this before any serious results come from it.  
Thanks for reading. Any advice would be so much appreciated.