I have purchased several. Three or four for myself and a couple dozen over the years for the high school I direct the musical for and a small theater in town I work with. For the school, we have stuck with Shure systems. Shure is always a safe bet and their repair services, if needed, are reliable. But...
There are all kinds of good wireless outfits, Sennheiser might be the top dog and Audio Technica is always good...
And, from my experience, many of the cheap systems work just fine. I purchased a Samson system last year and it sounds great and it is built like a tank; metal housing and sturdy controls. And a fellow I know that runs sound in town for weddings, small theaters, and business conferences buys all kinds of inexpensive systems I have never heard of but are working out great for him, and he runs them like dogs.
If a couple hundred bucks here or there don't matter, get a Shure (or if you want the top dog, Sennheiser). But, I have no qualms about recommending a $300 Samson system (which will be the full equal of a $600 Shure system). And there are other brands that cost less and work fine, it's just hard to keep track of them
(and for school/institutional use they may not be the best bet because you don't know if they will have a repair shop in this country or even be in business a few years down the road. Samson, on the other hand has been around for 20 years or more and it is climbing up the quality ladder... some of their stuff now is really quite good... Samson is kind of like Behringer, another "used to be cheap but now is a legit bargain with stuff that works".
My advice, call up Sweetwater Sound. You will get good advice, some service, and a good price (Full Compass is also good, but I've come to prefer Sweetwater). Tell them what you want to do. If they say Sennheiser or Shure (and they likely will), ask them about Samson. Tell them dollars matter and you are only going so high (unless dollars don't matter, then get the Sennheiser
)