Do you want isolation or not? If you want no isolation, then get the Sennheiser PX100II. If you want some isolation, I suggest that you get the JVC HA-S650 for a warmer sound, or go for the best value, which is the $12 JVC HA-S160 which sounds great but has a more balanced sound signature with a more moderate amount of bass.
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Also, Sennheiser isn't known for their bass. I looked at the HD429/439, those aren't really portable.
I've tried the HD219s. The 219s have a little isolation, they're extremely comfortable, but IMO they have less bass than the PX100ii.
The PX100ii are portable, have no isolation, fit really good but maybe a little less comfortable than the 219s, definitely warmer sounding than the 219s.
Have you tried the mere ht21?