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Rufus idles at about 800 rpm (how accurate is that tach?). Its got fairly nasty Ruf cams, so that may be the reason for the faster idle? I still have the dual mass flywheel.
If I recall correctly from the service manual, it should be 800 a/c off and 880 a/c on. Make sure to duck your head so that you're viewing the tachometer straight-on as your normal seating position makes the needle appear 100-200RPM lower.
Oliver, here's another data point, on cold start-up, the Turbo idles at about 1,050 RPM, until the high idle kicks down. Less than a minute. Air temp was about 50ish.