I do the opposite of you... I wear western boots with English tack. I just find them more comfortable AND I love my boots (Ariat Fatbaby). I don't do any competing so I don't feel I need to spend the cash, even if I look totally dumb riding around in turquoise cowboy boots... haha.
I always wear breeches though. Jeans don't feel flexible enough to ride in and they're just too hot in summer.