What ever you do, if you want it to retain some sort of value, buy a mechanical movement. A stainless steel chorono or something. Second, buy second hand, most of the bite has been taken out of the price. Third dont get fooled by "Iced products"You pay huge mark ups for inferior bird seed diamonds. Start cruising the pawn or second hand shops to get a feel for the pricing. It is not likely that you will steal anything, but most of those guys will negotiate and give you a decent cash deal. Stay away from fashion time pieces such as Gucci and the like, they do Not retain value at all.
