I haven't found Maggies to be as difficult to drive as they are reputed to be, at least the smaller models anyway. My guess would be that any of the receivers you mentioned, except for the NAD T744, would be adequate.
As far as sound goes, MAYBE the Cambridge and Rotel could produce a somewhat bright presentation. The NAD would probably be the most laid back. I don't have any experience with B&K stuff.
Finally, why not keep the Denon you have now and see how that works before investing in a new receiver? Denon's stuff is generally very good, even the entry level models, especially when it comes to powering what amounts to satellites. And the slightly warm sound of the Denon might make for a nice balance with the Maggies.
Finally, if you feel you do turn out to need a new receiver, don't count out Onkyo and Yamaha. Some of their latest models in the $500-$700 range (brand new) are surprisingly good, even with 2-channel music.
As far as sound goes, MAYBE the Cambridge and Rotel could produce a somewhat bright presentation. The NAD would probably be the most laid back. I don't have any experience with B&K stuff.
Finally, why not keep the Denon you have now and see how that works before investing in a new receiver? Denon's stuff is generally very good, even the entry level models, especially when it comes to powering what amounts to satellites. And the slightly warm sound of the Denon might make for a nice balance with the Maggies.
Finally, if you feel you do turn out to need a new receiver, don't count out Onkyo and Yamaha. Some of their latest models in the $500-$700 range (brand new) are surprisingly good, even with 2-channel music.