Proceed AMP-2 vs BPA-2 / HPA-2


What are the sonic differences between the AMP series and the BPA/HPA series? I've read the AMP series can be a little dryer, but I read that quoting someone who was quoting someone so it's 4th hand information. Does anyone have any real world comparison experience?

I recently acquired a Proceed PAV for a new budget dedicated 2 channel reference (for me) system I am putting together.

In the next couple of months I am going to add a new amplifier. This new amp will drive NHT 2.5i's. I guess you could say I am putting together a mid 90s vintage system. I fell in love with Proceed gear looking at ads and reviews back in HS and College but it was obviously out of my league. I was reading recently about how the old Proceed HT gear is a great bargain for 2 channel listening as well. A PAV popped up in a local craigslist ad and I pounced on it. A few days later the NHT speakers came up (an extremely rare case of WAF with regards to towers).

I am coming from an Arcam A80 integrated which will remain with my HT/2 channel set up. Eventually, once I've transitioned everything, the sources will be: rega p2/goldring 1042/grado ph-1 and an appleTV with either a Cambridge DACMagic or a Bel Canto DAC 1.5.

All that being said, I really want to stay in the Proceed family (unfortunately as an architect, aesthetics are a major deal to me) to match my PAV. Also I'd like to stay within the $500-$600 budget which seems like is the price range for an AMP2 or BPA2. However, I've read great things about the HPA2.

My basic questions are: 1)which is the best amp for my system? What are the sonic differences between the AMP series and the BPA/HPA series?

I suppose if I went outside the Proceed family, I would be interested in MAC amps or Bel Canto, but that is neither here nor there.

Thanks for any advice.
kjhawkm
me and my friend both had AMP2 for over 8 years, never had any issue! love the amp.  Not sure now BPA2 compare to AMP2. Anyone had both models please kindly share the comparison.     
get the HPA, it has more control. They have I fixed price of 500 a channel if they go out now, they just replace the entire channel.