Hi,
I am using a 7 channel Titan that I traded a 5 channel Titan in for a year or so ago. Never a problem with either. Both sound good as they are the same thing with the 7 being heavier to move and believe me the 5 channel isn't light. I to am using the Krell HTS 7.1 Pre and I also like it fine. I am using this setup on a all Dynaudio 7 channel system including a pair of Dyn power sub's. Very happy. I would personally purchase the Titan again over the other units that you have mentioned. I also really like the rear connectors. Hope this helps you out.
I am using a 7 channel Titan that I traded a 5 channel Titan in for a year or so ago. Never a problem with either. Both sound good as they are the same thing with the 7 being heavier to move and believe me the 5 channel isn't light. I to am using the Krell HTS 7.1 Pre and I also like it fine. I am using this setup on a all Dynaudio 7 channel system including a pair of Dyn power sub's. Very happy. I would personally purchase the Titan again over the other units that you have mentioned. I also really like the rear connectors. Hope this helps you out.