Please use the wait to brush up on dog training and learning theory.
Review, or learn and understand the four quadrants of operant conditioning.
Positive Reinforcement (dog does thing to gain something it wants, rewards, clicker/marker training, treats)
Negative Reinforcement (dog does things to avoid, or lessen something it doesn't want, leash pressure, low level stim (an unpleasant sensation).
Negative Punishment (dog learns not to do something because it looses an expected privilege, dog jumps up and scratches door, you don't let the dog out)
Positive Punishment (dog learns not to do something because something unpleasant happens, dog lunges at squirrel, dog hits the end of his training collar, etc.)
above is not a primer, just a quick idea, many websites cover this (along with lots of animal rights politics-fun).
Management (using physical but (supposedly) non-aversive barriers to avoid unwanted behaviour (crates, gates, leashes, long lines, etc)
Extinction (dog stops doing something because he gets nothing out of the behaviour. Dog jumps up on human, human ignores dog)
You'er doing the clicker training wrong (judging by the results-confused dog). Your dog will be equally confused by an e-collar, and less happy. Often a 'stubborn' dog is actually a confused dog (not always, sometimes it's just a dog that likes squirrels better) and then you need to figure out how to be less confusing.
Get a better ecollar, I have the Einstein mini-educator. Has a very good range of LOW LEVEL stim; this is important. It cost what for me is a small fortune, but seeing him run and jump joyfully off-lead in the woods, worth it.
I only use the e-collar for off-lead in the woods. Others train everything with e-collars. Then there is everything in between. It's important to know all of those things before you decide what to do with your dog. Even if you hire a professional trainer, it's important to know as much as possible. Not all trainers are created equal. You might not share their ethics, etc...
I highly recommend Lou Castle's site to get you up to speed on how these things work.
Dobbs training, I think, also has some outlines.
I clicker train my dog to 'do' things, lots of treats, toys if he's into that, I give him choices when it's safe to do so.
I use negative reinforcement and positive reinforcement to train safety behaviours when management would be worse for the dog (ie, offleash is important, so he wears an ecollar for that). Those are my ethics. It's your dog and your choice but if you don't know how things work, and how dogs learn, you can't actually choose.
I hope that helps. Be happy to answer questions to how I train, but it's a very personal choice.
...but I am a just dog nerd, train my own dogs, read up on everything, try things, dabble in dog sports--it's good to know where folks are coming from when you're reading their advice (that's why I'm saying that) .