First - that's a really lovely recording!! Wow!!
Second, the AEA and Royer microphones are all great. I ended up getting a pair of the R101s because I think they are a little more flexible, where the R84 sounds a LOT like a good old RCA ribbon - which is always a good thing, and sometimes exactly what you want. The Royer microphones, to my ears, are a little more present, some might even say brighter, although I think it is more that they just extend a little further or more smoothly or who the heck tries to describe sound<G>?
Oh yeah, they were also more affordable. I use a Millenia Media HV-37 as my main preamplifier, so I can't comment on the AEA, but I can comment on the Great River gear - it is fantastic, a little more colorful than the HV-37, but again, sometimes that is what you want.
And the folks at Royer might complain, but I can't hear the difference between an R-101 and an R-121. Could be my monitors, could be my ears, but I couldn't pick one from the other. I think the R-121 is going to be easier to position, but I'll wrestle a little for the savings<G>!
The combination of the R84 and the R-121 is clearly awesome, so that's another option (for those of us who like to spend other people's money!)
Bottom line - I don't think you can make a bad choice...