Pat, with the quantity of external gear you plan to use, the only thing I would definitely consider changing out of your current set up is the Radio Shack Mixer. Not because it is Radio Shack or the quality, etc. but because of the additional features you will find quickly to become indispensable and the additional in's and out's you will have from a full featured mixer. You will also likely see an immediate improvement in sound quality because you will have higher quality preamps and channel strip. Your monitor mix choices will be better and more varied, you can add a record mix to archive your performances if you wish plus you will have much greater ability to control feedback. Full featured units by Behringer, Yamaha, Mackie and Peavy are abundant on CraigsList and Ebay. I would suggest you will also prefer one of the newer models that have USB. The mixer is the hub for everything and is to me, the only actual 'weak link' in your PA system. As an aside, a better mixer/preamp and higher quality channel strip over the Radio Shack mixer may also eliminate the need for the Presonus channel strip.

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