Of the ones you have mentioned, I have heard the EPH100 and own the RE400 and HF2 (which is the same as HF5 with mic). I owned the VSonic GR07 MKI, but have never heard the MK2 or the BE.
I would leave out EPH-100 unless you are particular about bass. It is not a detailed IEM, rather a very smooth sounding IEM with good sound stage, separation, but a slightly uneven, yet far from hurting ears treble. It is a very nice IEM to fall in love with, but if you are after 'digging details', then it may not suit you.
GR07, much like most VSonics, has sibilance issue. Otherwise, I loved it's bass and comfort. The dynamics was not great, but it could go well with every genre. GR07BE (which despite it's name has less bass than bass-heavy sets) is said to have less sibilance and all the good characteristics of GR07. I would keep it as the best choice to cover all bases. You should try and get GR07 from LendMeUrEars, Singapore. They were selling it for $130 or so last time I checked. Being official dealers and all and them 'knowing' Indian customs, you should not have an issue getting them.
HF2 (or HF5 or HF3) is something you would be satisfied with for details from the mid range and up. They all require deeper insertion with tri-flanges to get that bass. While bass quality is good, quantity is not great. Of course, Etys do not know what sound stage is. Otherwise, they tick the details, high frequency extension thing. Comfortable fit? As long as you train yourself to push tri-flanges where no ear tip has gone before.
RE-400 is a good compromise as well. I'd put it right behind GR07. It has a slightly mid-centric sound, a smaller in-the-head sound stage, but with very good presentation. It lacks sub-bass a little bit and it's treble is a bit smooth (not much sparkle there), but has very good value for money considering the price it sells for. But, on Hifinage, once you add the taxes, price will be a little more than 6200.
I don't know anything about UE-600.
I'd think that Philips Fidelio S2 could be a contender. From what Joker says, it is more of a GR07 than RE-400. The only thing I am not sure is if it is a bit cold sounding as Joker mentioned in a recent comparison, it is not 'exciting'. Otherwise, it ticks all the right boxes as far as sound goes.