Do they go on sale, if so when?
What's the difference between the premier (~170$$) vs the authentic (>300$$$$)?
Is there any possibility of a slight uniform change next year that would make me regret dishing out the cash right now?
Any other jersey buying tips (is there a best place to purchase?) are very welcome,
Jersey City is a fine place to get official jerseys. I don't see them changing their current main home and road jerseys - they are very popular with the fans. I'm pretty sure this is the last season for the navy blue alternate though.
The authentic jerseys (apart from costing a lot more), are constructed better, and you can really tell when looking up close. They've got the fighting strap on the back of the jersey and I'm fairly certain they're hand sewn. Plus the tag on the bottom of the replica jerseys is nonexistent on the authentic ones. Whether you feel the money is worth spending is up to you.