i'd say the klipsch S4i, s5i or the newer models may help you out at the high end of the price bracket, easy and comfortable to use, and about on par with the ety HF3's in my opinion.
the phonak PFE's are apparently good quality earphones, probably not on par with the etymotic HF3's or the shure se420/se535 or the UE tripleFi 10vi's, but you can get them cheaper than US/amazon/retail, maybe on ebay or via EU/UK/HK/CN sites.
comply foam pads will probably be the best aftermarket for high end headsets anyway for removal/reinsertion, and any reviews should include those for comparison and quality concerns, and if they work for those headsets or cause problems. custom moulds are fantastic, and they do improve sound, naturally, which makes any brand sound great, relatively speaking. but it's really cheating in comparing a custom mould vs the retail of another set, as head-fi probably often does just to 'baseline' $100 models against $400-900 models.
that said, the ety triple flange is okay at noise reduction and reinsertion comfort, if you don't mind the squish factor (i'm a er6i and hf2 owner) . overall, the comply or alternative branded foam tips are way, way easier if you need isolation, but a decent olive or single flange that fits will work just as well for isolation and mechanical noise (train/bus/airplane/traffic), if it fits. if not, the foam tips may help a lot to make them usable in public places.
especially important if you just want to buy the one pair of headset earphones, is any review that discusses build quality and common faults.
i went over this last year, and after a bit of dithering, bought the Shure SE 115m+ that were cheaper and do the job, and have a fairly thick cable that doesn't tangle too badly or warp the plug wiring if you keep your iphone in a pocket. good for everyday, and those have replaced 5 other iphone headsets for me so far, just for convenience.
the sennheiser MM50IP are also cheaper, with thinner wires, which are pretty good cheap models, the mm70s, i dont think are as good. the pair i had were great, but did not meet the curious feline test all that well. (very few earphones do, sadly)
I love Ultimate Ears headphones too. I figured some of the engineering that goes into their professional models has to trickle down to their consumer grade units.
there's the Ultimate Ears 4vi/5vi's, but they break quite often due to poor manufacturing, and i've bought 3, all dead due to intrinsic build quality within a year (faults with wiring at joints). any quality assurance or improved build n the 4's and 5's is whisper thin, mostly due to the highly insulated, replaceable wire cord that the 5 pro and the 10 vi's have, is not an option for the mid end models or the low end models. which is unfortunate.
while the triple Fi 10vi's are the best of the range, people either love or worship them, and for the price, it may be justifiable to worship them, especially at the first sign of trouble.
as for the rest of the 3 button headset + mic series (for iphone/ipod), not many companies send them to reviewers for comparison, so it's hard to really find a nice handle on what they sound like or how they work after a few months of daily use.
i hear mixed reviews on the v-moda series of headset earphones, i like the designs, but that's not the main factor for earphones once you've bought a few.
the jbuds, and the monster beats/turbines, to me have a similar rep to those of the v-modas, some are great, some are great for 20 minutes, some just look great. i just don't know if i'd buy them.
) and can't stand the ear buds that Apple provided. 
I'll let you know what I think when they arrive! 
