1. Happy with current gear
2. Curiously check head-fi, just this one time.
3. Learn all about new release.
4. New release makes your current gear sound like crap.
5. Order new release.
6. Read 759 reviews and impressions about new release being best ever.
7. New release arrives and becomes current gear.
8. Try out current gear, learn it’s somehow lacking.
9. Return to Step 2.
There is a cure.... Filter the information!
Disinformation is as big a problem in audio as anywhere else. Look carefully at your sources.
Anything from the manufacturer/promoter/seller is as biased as hell. Some reviewers praise everything, lets get real, some stuff is crap! Other reviewers can't seem to see past their own favorites. Nobody wants to jump up and down in public saying "Look what stupid choices I made!".
Airy spacious treble, is someone else's piercing sibilant treble. Warm and bright are diametrically opposed, it comes down to personal preference. We hear differently and like different music. Find reviews from people with similar tastes, or at the very least, who acknowledge different preferences. Akros, Crin, Paul Wasabii, Porta Fi and Vortex are my picks on YouTube.
Different manufacturers tend towards their own house tunings. Try a range of different styles. Do you want to end up with a bunch of identically tuned IEMs and only listen to the best one? Don't go for something super bright if you're treble sensitive, but otherwise you may find something new, that sounds better for different genres of music.
Sound samples provide some information if you can't audition gear yourself (hats off to Zplolt, SiriusB, Poles Audio and Dans Audio Reviews). Graphs don't tell the whole story but they can give an indication of tuning. How scooped are the mids. Does the bass look to be mid or sub bass focused (or MIA). Any peaks that look potentially annoying. If nothing else, reviewers explaining what they heard is useful. Graphs don't show you imaging, attack, note weight, or how natural the instruments sound etc.
Lastly don't rush! An extra pair of foam tips and a $3 case aren't worth forking over $100 or whatever, on a lemon. Once the smoke clears on FOTM, some retailers will have overstocked. More reviews will be out too, hopefully more objective. Then the real bargains appear!
Learn to be happy with whatever you have, The idea is to enjoy your music, not to be permanently unhappy with it!