Tvad,
Regarding the published specs for sensitivity and impedance. Take these with a grain of salt. At least one manufacturer on your list, Coincident, has, on more than one ocassion, printed sensitivitiy numbers that are MUCH higher than reviewers' test results. No doubt that the Coincident speakers are high sensitivity models, it's just that comparisons of printed specs can be misleading because there is evidently a lot of latitude in determining these #s.
Printed specs are a good place to start narrowing the field, but I'd try to talk to a dealer who handles both one of your possible amps and possible speakers to get some feedback on the combo. I'm specifically thinking Adagio/PrimaLuna at Upscale (because I was so impressed with the speaker when I heard it - at Katli), but it's probably just good general practice for this task. Best of luck in the hunt.
Marty