I can't comment on the actual warranties; I trust buckeyefan 1 knows what he's talking about regarding the warranties. However, there are other potential problems inherent in purchasing electronic gear from an unauthorized dealer. The main problem is that you don't know what you're getting for your money. If you do some research on the Internet, you will find many examples of folks just like yourself who expect to receive a new-in-box unit, factory-sealed unit and instead receive a unit which has been opened, used, damaged, refurbished or worse yet, counterfeit. Then you are faced with the hassle of dealing with rude and inconsiderate people in an effort to resolve the situation.
Here's what the New York Better Business Bureau had to say about etronics.com:
BBB.
Note the number and type of complaints. That is only for the folks who took the time to file a formal complaint with the BBB; it doesn't include those who had problems and either resolved them or did not take the time or effort to contact the BBB.
With respect to each of the unauthorized dealers listed at shopzilla.com, run each through the BBB (most are Brooklyn-based electronics stores). Also do some on-line research, i.e., Google, etc.
Not everyone who buys from an unauthorized dealer has problems, but enough of them do that it behooves you to go into this with your eyes open. There are advantages to purchasing from an authorized dealer not the least of which is that you will have the peace of mind knowing that the manufacturer is the one standing behind your gear. If there's something wrong with your unit, who will be the one to actually work on it? Someone you trust to use the correct parts, etc. You have to decide if the price difference is worth the possibility of buying counterfeit/used/damaged/dead-on-arrival/refurbished gear. It's your money.
Good luck!