The K2 is great. I like the old school form factor. But a KX2 is pretty awesome. Much better for taking out hiking, etc.
I have an original QCX 20m rig and is a great little rig. I never got more than 2W out of it but that is not a huge limitation. The RX is hard to beat. The QCX is hands down the best phasing rig I have played with. And they are not expensive so get a 40m next time. I'm in the process of trying to homebrew a phasing cw rig on 40m. The RX is great but the phasing is fighting with me. The more I work on it the more I am amazed at the QCX. I'm going to buy more QCX rigs but not until I complete this journey. I'm torn between the mini and the new larger format. The mini is great in that I could throw 2 or 3 in my bag, but the other offers more in terms of base use and experimenting. Life is full of challenging decisions.
73,
Mark
KC4GIA