I'm not sure the HSU VTF2.4 is outright better than the LV12R, I would say they are pretty similar. Now the VTF3.4 is a step up and will have more output and extension, and be more accurate, but you obviously pay more.
I think you would really enjoy the Ascend speakers, and the Rythmik sub is very good. Also you get a discount for buying a Rythmik sub with Ascend speakers, so you can save a little cash that way. If you are considering the SM350 for surrounds, I would just go with the CBM-170 instead. This way you have a matching setup and those DefTechs would be difficult to mount because they are pretty heavy IIRC.
Denon AVR-1713 | EMP E55Ti | EMP E56Ci | EMP E5Bi | BIC F-12