trying to decide on a radio
Make mine one vote for the RD6000. I love mine... enough mixing options to keep you busy for quite a while. It's got one or two... nice features... throttle cut (You simply push a button to drive the throttle servo all the way closed to kill the engine...no monkeying around with the throttle trim) and a built in countdown(or count-up) timer...start the timer when you take off and it will let you know when it's time to land. Pretty easy to program too. I had a problem with the throttle lever on mine and had to send it back for servicing...had excellent treatment and service from their customer service people!
As far as computer vs non-computer...you can program a computer radio to do as little as you want it to...or as much as it is capable of...
Can't comment on your other choices though....
Hope this helps
Oh yeah, one more thing, you can select which shift (+ve or -ve) to use, so you can use other manufacturer's receivers if you so desire!