Here's one of several sites that gives some great "readiness" checklists, plus the skinny on the various approaches to potty-training, their advantages and challenges. It's fantastic that you've got your son pretty much poop-trained. For the pee, I wonder whether he is ready for success yet. See if you can find your situation here: http://www.parentingscience.com/toilet-training-readiness...
Potty training is ultimately a process that the child must control, or else he's not trained. A number of factors are needed for potty training to succeed: the child must be able to notice and recognize the urge before it happens, he must have adequate sphincter control and the ability to hold it long enough to get to the potty, he must understand the point of training, and he must want to be trained. It sounds like at least one or two of these is still missing for your son.
Additionally, night training is a whole separate step for many children, and can lag a year (or several) behind day training. It's not too unusual for third or fourth graders to need diapers at night, and for a few unfortunate kids, they reach adolescence before they stop bedwetting. Their sleep is too heavy for the full-bladder signal to get through, and/or the sphincter isn't strong enough to hold a full bladder. This is more common in boys. They really are not doing this on purpose, and many of them are horrified and ashamed of not being able to stay dry through the night.
Sometimes rewards work in the short run if only motivation is lacking. But that introduces the very real possibility that rewards/bribes will need to escalate to keep him motivated, and that is a mistake that you will seriously regret someday.
So, what I would suggest is that, as hard as this will be, tell your son you are proud of how well he's growing up, and express your confidence that he will use the potty when he's ready – when he notices that taking a few minutes to go to the bathroom will be easier for him than getting changed.
Kids WANT to make this developmental step when they're ready, just as they want to walk and talk when they're ready. Your son will probably need some "space" to work it through for himself. Or he may need a few more weeks or months. Consider what a large fraction of his life the next three months will be, and how much change you see in him from one week to the next.
Meanwhile, you can continue to make all your messages about using the bathroom as positive as possible. That can include modeling how easy/quick it is for you or Daddy, reading potty books or watching potty videos, having his toys/stuffed animals role-play pottying, and in general making a game of it. With my grandson, once he could do it but didn't want to take the time, I would go into the bathroom and begin noisily ejecting all the dinosaurs that were crowding the room and sitting all over the toilet seat. My grandson couldn't resist that game, and would come in and help me wrestle the beasts, and claim his spot on the toilet.