English is not my native language... so... beware !!!

Intro (you can skip this if you don't have time: ) :
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In a few days I'll buy Creative Zen or Sony A818... now I already have Pioneer Se-cl30's... before them I had mx100 that came with my old iRiver T30... so they were significant improvement... balanced, very clean, perfect treble and reasonably detailed - but midds and bass are very bad, nasal or even non existing... still way better than mx100's...

Now I know that A818 comes with ex-82 (same as ex-85 and similar but bit inferior to ex-90 -metal casing and staff)... still many reviews seriously criticize their performance with highs... and I don't want to sacrifice highs... crisp, rich highs and details are a must for me...
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Main Part:

Now, I need something better from Pioneer SE-CL30's... I need very good detailed (never enough: ) and clean in-ear headphones without big sacrifice on highs, mids, lows, bass, trebble quality etc... I have %50 discount card for one local store and this is all they have:

Now, I have a choise between:

1. Sennheiser CX500,
2. Sennheiser CX400,
3. Sennheiser CX300,
4. Creative EP630.

I heard EP630 before and I HATE them... way too bassy = bad highs... not much details too... can I expect anything better from Sennheiser's (especially from CX500)... How much improvement will I get over Pioneer Se-Cl30's (if any?)... are they a worthy upgrade for SE-Cl30's...

I don't have money for anything more than this... so please, don't suggest Etymotic's and stuff 'couse I'll start crying ...

They have Sennheiser CX95's too !!! ... Unless somebody suggests something different - I'm going for these

I bought Sennheiser CX 95 and after proper burn in... I'll just say I totally agree with guys at cnet.co.uk...

Sennheiser CX 95 Full Review, Accessory Reviews on CNET.co.uk

Considering the price, I believe these are excellent IEMs ...