Hello,
I recently purchased this system and had a couple questions. I got the combo with the lav/plug-in.

1. I have a typical Shure SM-58 handheld mic used on the butt plug. I noticed the level is very low. So I decided to plug my shotgun mic into it, and the levels are great. But obviously I can't use the shotgun mic for my "Reporter" type shoots. So, is there a particular handheld mic I should be looking at - maybe one that requires a battery? Will this get me a higher level? Budget is around $250.

2. I have hooked the 320 to my Beachtek on my FX-1, and it works great. Lav in one channel, Plug-In in other. Howver, I would like to utilize a total of three mics, without using another mixer. In other words combine my 320 Azden mics into one channel, which frees up the other channel for another input source. Azden didn't supply any cables to test this type of setup, so can it be done? I don't want to overload the one channel and do any damage. If okay, what kind of cable do I need to go from the 320 to the Beachtek?

Electrovoice RE50, Shure SM63, Shure 635, should all work fine. The 58 should be OK as well but if the levels a a bit low, is there a way to boost the levels on the receiver or plugin? The 51XT has a levels adjustwheel on it and I think the 320 does as well. I thiught the 320 uses the 51XT plugin. I might be wrong but...

There is a "Y" cable that will take 2 XLRs into 1 but again IIRC the 320 uses minis and I'm not sure there is a cable for that but I would think there is.
I actually do that with my AT1823 receiver. I plug my hpyercaroid (on the camera) and 1 lav together (for wedding ceremonies) into channel 1 of my 170 and then the 2nd lav (grooms mic) goes to channel 2. It works great and the audio is easy to sweeten. The #1 lav is on the lectern so it gets the music and readers of course and the hyper fills in the blanks. The grooms mic get the B&G and the officiant. Easy audio at least for me.

Don