I have an Amira Expert SL4, which is in Ultegra. I LOVE IT, but hate the zebra look but most people like it. I like a flashy coloured bike so I'm no reference when it comes to neutral looking colours. hihi. Very stable. A pedal stroke and you're gone with very little efforts (ok... some efforts). I am not afraid at all on it vs the Kuota Kharma I had no control over. Note that I have American Classic wheels on it and they too end up being a good combo vs the basic wheels that came with it (that I had bike shop keep - which reduced my price some).
I can't say for the other bikes you're looking at but the Amira should be a good option if you decide to go that way.