Unfortunately, the truth of the matter is that not everyone has the luxury to try before they buy. Whilst the internet has made it incredibly easy for us to order things from other countries, if they're not available locally, many people rely on reviews for when a product isn't available in their local market.
I understand that but seeing as the OP makes reference to being at an engineering school with a full prototyping lab. This would normally make it a fairly large institution so I'm going to bet that someone else in that population probably owns most of the products we are discussing and would provide the opportunity to listen to a lot of different iems if you took the trouble to setup a meet.
I live in a smaller community without any dedicated audio shops, but I travel to meets when I can and we actively trade things around to test. I've eve sent things to others to audition via UPS on occasion so even if it isn't immediately available, with a little work it is often possible. Again, the more you spend, the less likely I would be to use reviews alone in making my decision even if it means postponing the decision and planning to travel.