Good options for monitor Audio sliver line

paraneer nailed it.  The new Yamaha integrateds ~$2K, might be worth checking out, some very positive vibe.  

if you get an integrated with a HT pass through, your main speakers would be driven by the amp in the integrated when it was in pass-through mode, you would still use sub hook-up on the AVR and the pre-out from the AVR to the integrated for the front two channels, the other speakers would be driven by your amp in the avr. I am a fan of this because it lets you have a better two channel performance while also meshing in with the home theater application.  You can also effectively do the same thing with an integrated without HT pass through by setting the volume level on the integrated to the same spot when you are using the HT but this can be a little risky as if you forget the volume up on high and flip sources then it will be pretty loud.  I wouldn't trust myself, it would be a matter of time before I would make the mistake.  

I did the HT pass through for a long time but ended up with a pre-amp and amp that were not really compatible for this type of application so I go a second set of front speakers for my HT and run two independent systems. I know that the HT would perform better with the better speakers but you know, life if full of compromises.

I am not a sub expert but I believe it would be a challenge to use in both applications with a HT pass through set-up.  Most just use the sub for the HT aspect.  Your speakers by themselves should perform pretty damn well in bass department with a good amp driving them.