Um... I don't want to piddle on your strawberries here, but surely if the watch was an anniversary gift, then rushing out to immediately swap it would seem a little off, no?
Just my tuppence ha'penny.
OP, I am not saying that you have to wear the watch until the end of time (I am extremely picky about watches), but you would do yourself a very large favor by talking with your wife about the watch she bought you. Lay it all out in a tactful manner, and see how she reacts before you buy anything. Women are not like men (duh ), and many get their feelings hurt over things like what you wanting to do.
Tread carefully and hopefully it will all work out for you. Just make sure that she does not see this thread, or your ass is on the couch