I'm trying to find a good website to choose my surgical loupes, what is an appropriate price to pay for them, what brand is more exeptional than the next, and lastly, what is the level of magnification that is recommended for a gen surgery residency?
I highly recommend using the search function because there are tons of questions on this topic, with some lengthy threads, both here, in the PRS and the Ophtho forums.
Secondly, are you really a medical student? If so, be aware that many programs purchase them for their categorical residents. I cannot imagine that you would need them as a medical student and I would wait to purchase them until I knew for sure that someone else wasn't paying for them.
2.5 is adequate for general surgery. Some have the 3.5 mag but these generally tend to be people doing microvascular stuff like the PRS guys.
Designs for Vision are the most popular brand and are what the vast majority of us have. You may find another brand that you like better; its a matter of trying them, seeing what service you will get, price etc.
Expect to pay, with an educational/resident discount around $900-$1100 or so. If there are a group purchasing them they may be less, if its just you, you might pay more. They are fit for you, so I do not recommend purchasing used ones unless you are willing to spend some money to have them refit for your focal length, etc.