Hi.
1) Although the “rule” in PA is, you get what you pay for, a 100 dollar difference is still considered the same price range. Unless you can find somebody that has both or has used both, it’s hard to get an unbiased opinion I guess. Best would be to take your favorite track, one you know intimately, take it to a store that sells both and perhaps something from another brand as well and do some direct comparison. Be sure to set everything to 0dB so they get the same input. Personally I have decided against the EON’s a couple of years back when I bought my Mackies. They sounded decidedly worse. The only two that I liked (out of a bout 12 different speakers) where the Mackies (HD-series) and the TurboSound. But that was then and it was me. You have to listen for yourself. Trust your ears.
2) If you use a mic and your controller has a mic input, you don’t need another mixer. Just plug everything in and be on your way.
3) Yes and no. Yes, you’d need to convert from RCA to XLR and No, that cable has female XLR whereas your speakers will require male connnectors (for audio: Pin Points Signal = male to female signal transfer).
There is another snag in this setup though. RCA should be kept to a short distance (say 6 feet max). This is fine to hook up your rca to rca connections to a club/venue mixer. But the distance from the floor to your speakers on a stand will already be 6ft and then you have to go to the controller still. Not unlikely you’ll pass some noise-induction on the way. So, you are either back to getting a small PA (not DJ!) mixera after all. It will have XLR (balanced) out and now you run your rca into the mixer and XLR (long distances not a problem, so put your speakers where you want them) to your speakers. Alternatively you can get a small rca to XLR converter for about 50 bucks that you run your rca into and that offers balanced XLR outputs.
Hope that helps.
Greetinx.