Bass quality in ear headphones?

Hi, I want to know what should I look for when searching for quality and bass on in ear headphones section?

I just bought Audio Technica ATH-CK323M and they deliver awesome clear sound but no bass.

Now I had many rubber cups to replace them and I must say I got used to my Sony Ericsson hole sizes,

while Technica ones were too small and Antec dBs were too big.

Now they're fine ATM with custom Sony Ericsson earcups, but for my next purschase I'd like to know what should I look for when buying bass and quality based? driver size? frequency?

just get a pair of shure SE215's. they run about a hundred bux.

LOL I'm not speding that amount on my home headphones you want me to spend such amount for long travels that I do once in a lifetime?

Klipsch s4. I swear to god, its all the audio bass you'll need for as low as 50-ish. Just don't expect any real rumble from in ear as it is not physically possible.

@PredatorRules:

Hundred bux is reasonable for a good pair of headphones. you might be able to find a used pair cheaper on ebay.