With 75% of your listening being critical listening, I would recommend you start the 2 channel building process by purchasing a dedicated 2 channel amp (I assume the Integra allows for external amp use). Once you buy a decent amp, you can then look to buying a preamp that has HT pass thru which would allow you to still use the Integra as a processor as well as it's amp to push your CC and surrounds while using the new 2 channel amp to push your mains.
Bwyoung does make a valid point. Maybe the source is the problem, or even some new cables would help, but a reciever isn't the best animal for 2 channel listening.
Bwyoung does make a valid point. Maybe the source is the problem, or even some new cables would help, but a reciever isn't the best animal for 2 channel listening.