I second ATI as a good option for an amp - 1505 or 1805. If you could get a 3 channel (or pick up a 2 channel and add a third through ATI - although the shipping may kill you) you could drive the rear channels with the receiver. B&K 200 watt/channel would also be an option. I think ATI or B&K are both more dynamic than Rotel.
As you probably know, the SF Home center is not up to the quality of the GP. A Thiel SCS4 would be a good option. I used an SCS3 with GPs and the SCS4 is better and cheaper at list.
If you want to use the GP for music, you could also consider a separate 2 channel to drive the GP and let the receiver drive the center and surrounds. You would need pre-outs from the receiver to drive the 2 channel integrated. More complicated, but worth it if getting the most out of the GP for music is important.
As you probably know, the SF Home center is not up to the quality of the GP. A Thiel SCS4 would be a good option. I used an SCS3 with GPs and the SCS4 is better and cheaper at list.
If you want to use the GP for music, you could also consider a separate 2 channel to drive the GP and let the receiver drive the center and surrounds. You would need pre-outs from the receiver to drive the 2 channel integrated. More complicated, but worth it if getting the most out of the GP for music is important.