And that, i'm afraid, it's the hardest part of it all
Maybe it's just my neck of the woods but trying to find a music store within 50 miles of my home that stocks any of the mics i want to try is nigh on impossible. Alot of the time i have to resort to hunting around the internet for audio and video clips, reviews and general hearsay and, even then, you have to take all that with a huge pinch of salt. However, if you're very lucky, you could always take you and your flute to your nearest music store and try out what mics they've got. I was very lucky when i bought my monitors as my parents live a mile away from absolutemusic and, as i was down to visit them, it made sense to pop in a try out the monitors. I'm glad i did, but then again, i already had a fair idea of what i wanted and hearing them just solidified my opinion.
sE electronics do have a free 7 day loan service in the UK so you could easily try the sE mic and then return it and, if you like it, buy one, and if you don't at least you can rule it out. It may be worth phoning some stores/checking their webpages and seeing what their return policy is as you could always buy a mic and, again, if you don't like it, return it and get your money back. Worse comes to worst, buy one, try it, if you don't like it, bung it on ebay and make a slight loss, and then try another one.