One of the most revered personalities alive in TKD today, GrandMaster Cho, He Il spoke about western boxing in his book Man of Contrasts. That alone, is enough for me.
But, I also have a friend who was a golden gloves boxer (amateur). I can say this -- its hard to punch a boxer, much harder than I would think. They can avoid the punch very adeptly! No joke!
Also as was said before, you can try western boxing. IF IT FITS YOUR PERSONALITY, then go for it, you have found a good fit! If not, then you must search more. Its like trying to find the perfect mate!!! Once you find your match though, that is great!!!