If price for Rx's is important, seeing that you need to cover 4 classes, I would consider Graupner... they have an upper-mid level system called the X-8N and a luxury system called the X-8E, here's a quick breakdown of comparisons between both system on this post. The biggest selling point for me is Graupner USA offers a 2 year warranty.

If money is no object, then the only other brand I would personally consider right now is Futaba, but they are rather overpriced IMO which is the only reason I decided not to go with them.

Other brands that have disappointed me in the past are Radiopost and KO Propo.