How much difference between these items?

I am looking at getting parasound separates. What or how much difference is there between the A52 and the series 5215 amp? They are both 125w per ch. Is it worth the difference in price. I have seen them used for about $300 difference.
It looks like the Halo A52 has balanced inputs and some higher quality or at least tighter-tolerance parts. There's an open-box one at audioadvisor for $1699.

The 5125 appears to have higher current-output but the a52 can put out more Watts at 4ohms (?)...i would conclude that the A52 would have a better time driving harder-to-drive speakers.

I haven't heard the A52, but the 5125 is a very clean sounding ever-so-slightly lean sounding amp.