You should check your owner's manual for how often you need to replace things like plugs. Being a 1999 car, if I had spark plugs (I have a diesel) I would replace them, even though strictly on miles I doubt if they are do.
More important I would replace the plug wires, no matter what the manual says. I would use whatever is listed in the owner;s manual and I would expect it to be platinum.
[i] I got a quote from Acura [/i] Well I suspect that had a lot to do with the price. Dealers are seldom any better than independent mechanics but they almost always more expensive.
Dealers are no better (or worse) than independent mechanics for almost anything you might need done on your car. They will almost always charge more per hour and often more for parts and supplies. They also tend to look at repairs a little different than the independent.
A dealer may well recommend work that strictly may not be needed, but could be connected to the problem or maybe replace a part when a little repair would fix it ALMOST as good a new.
There is no need to bring your car to the dealer for any service other than service that is going to be paid for by a recall or original warrantee. During the warranty period be sure to have all required (as listed in the owner's manual) maintenance done and to document all maintenance work.
I suggest that most people would be better off finding a good independent (Not working for a chain) mechanic.
Note: Never ever use a quick oil change place. They are fast cheap and very very bad.