He's screaming for tougher boundaries. You said they key phrase: "I try my hardest to give this no attention"
The cruel hoax these days, is that so many people will tell you to ignore raging fits. But ignoring raging fits is absolutely the worst thing you can do. Some rare kids get over them on their own, but SO MANY kids are left with no choice but to throw even bigger fits and go to greater dramatic lengths-literally screaming for negative attention. You have listed some mild consequences here like taking luxuries away, but these too are rarely effective in a child who is having difficulty respecting parents and battling a huge temper. He doesn't care, because these things are no big deal. AND, if you're sometimes ignoring, he has no reason not to gamble.
You need to up the toughness BIG TIME and give him some more responsibilities he can be proud of in general. You know he CAN act well for others, so you know this is not medical. If I were you, I'd sit down and explain to him what will not be allowed from now on. Tell him how much you love him, and you cannot let him have an unhappy life or be a mean person. Explain you will be removing all the luxuries from his room, and he can earn them back as he behaves well. Assign times for certain things: One week of good behavior for the wii, one month for the TV,,etc....to be honest though, my oldest is six and has none of these electronics, your son may need to lose some of them permanently because he sounds like he's becoming very angry and entitled. Anyway, take it all away to be earned back-but this is NOT discipline, this is just taking away rewards he never should have had, and that he will now need to earn.
THEN, start enforcing serious consequences immediately after one warning when he begins tantrums, rudeness, whatever. Don't get mad, don't give several warnings, just re-state what he is doing and act right away. EVERY TIME. For excellent consequences for this age range check the book Back to Basics Discipline by Janet Campbell Matson. In addition to the firm immediate consequences, assign a tough chore after so he does some "Sweat equity" and accomplishes something. Also reset the time it will take to win back his luxuries, and repeat. At his advanced age, there is no "not understanding" or "lack of impulse control" issue going on. Once he sees you can't be trampled, he'll quit trying to trample you, and love you much more for it. He'll also like himself better.
As for messes and peeing. Cleaning is NOT a consequence. It is something we all do when we make a mess. He needs strong discipline for each infraction and then he can also help you clean up the mess. But the cleaning is not enough. And to be honest, for his age and with his level of rage and defiance, I would steer clear of the Love and Logic and 123 things. He'll get even more frustrated by more wishy washy stuff. He's not a toddler. I would go to cmt.com and watch some episodes of World's Strictest Parents. Very inspirational and helpful.