Unfortunately, there are not a lot of places where you can try before you buy. I no longer use a handheld mic, therefore, my last experience was several years ago using the Samson Q7, which is inexpensive, and provided excellent results.
Much of the quality you will get from any mic will be dependent upon YOUR vocal quality. Of course, some mics will respond better to high pitched voices, while others may respone best to mid range or lower, softer voices.
For the most OMB entertainers, our vocal ability is the dominant feature of our performances. Therefore, the cost of the mic is irrelevant just as long as we sound great to our audiences. Like DonM I have a lot of mics, all of which have their own attributes. They're all good, but some are just a bit better than others.
Good luck on your search,
Gary