Well glad you are still enjoying the S500's.
That's interesting about the bass. Your's must be "broken" cuz i had to turn down the bass setting on my clip to A/B the two. Both phones have an emphasized mid-bass. Maybe you are a "basshead" and the S500 might be a tad more emphasized especially with stock pads?
Anyway I don't really want to try to convince anybody that one is better than the other. They are different sounds with the Downtown having better midrange presentation and more relaxed highs. They are different and I happen to like the differences in the Phillips a bit more than I LIKE the S500.
@baardker - Don't get me wrong I still think the S500 is a great buy but even for $50 I would chose the uptowns with all considered. Mind you many people have paid over $120 from bestbuy for the uptown and at that price I would say the S500 is for sure the better bang for your buck.