I agree Cyrus 2 is a good amp but I have a feeling that it would run out of steam if pushed too much. It entirely depends on your listening habits. If you do not play it loud the Cyrus would be a great amp.
I have heard many NAD amps and also own one (25 watter) and I have a feeling that it may be a great all rounder for your 104, I have the Kef Reference 2 which is a direct decendant of the 104 in terms of woofer configuration, I can tell you that the Kef is a bear to drive. They needs loads of current and at your budget your best bet would be something like the NAD 370 used or even 372 if you can get hold of within your budget. NAD has very good reputation when it comes to budget equipment. Rotel as already pointed out is also a great chice to drive the KEF's but they are slightly forward sounding compared to the NAD. They tend to be slightly more expensive as well compared to NAD.
Good Luck with your hunting for an amp!
I have heard many NAD amps and also own one (25 watter) and I have a feeling that it may be a great all rounder for your 104, I have the Kef Reference 2 which is a direct decendant of the 104 in terms of woofer configuration, I can tell you that the Kef is a bear to drive. They needs loads of current and at your budget your best bet would be something like the NAD 370 used or even 372 if you can get hold of within your budget. NAD has very good reputation when it comes to budget equipment. Rotel as already pointed out is also a great chice to drive the KEF's but they are slightly forward sounding compared to the NAD. They tend to be slightly more expensive as well compared to NAD.
Good Luck with your hunting for an amp!