My boss was recently looking for a wireless portable set-up he could use for his large indoor/outdoor parties he holds a couple of times a year, so he had me do some research for him.
We ended up ordering from these guys after calling them up and discussing our needs with them. I don't know how their prices compare to others out there, but they had fantastic customer service, and really worked with us to make sure we got exactly what we needed. The product came in on time, and everything worked as promised.
The guy I spoke with the times I called was Monte (I believe that's how he spells his name), and at the time at least he was in charge of all the sales, and most, if not all, of the tech support. Great guy - give him a call to see if they can help you out.