ghn4ever, do consider Jazzfish's offer. If the price is good, it is a good pair of monitor speakers for the general user whose main aim is to play sounds off the keyboard. Remember you are not trying to start a studio.
I've been using the MS202 for more than 10 years before finally selling them off. I was using them for the exact same purpose as you - getting sounds off keyboards. It serves the purpose well.
Back to mixers: I only got my Mackie mixer when I had a number of modules. But after going totally software, my mixer no longer comes into much use except in occasions when I had to record vocals and live instruments. So it is now under-used. Keep your setup simple and minimal - therefore low cost. I would save all that money on getting better keyboards than all the paraphernalia.