sony str dh 730 vs 820

Hello,

Im trying to make a dissision between the sony 820 and the new.

I was focussed on the 820 (good review here, and bi-amping option) but now the str dh 730 has moved under my radar...

It looks like the2012 model 730 is about 99% the same as the 2011 model 820 but...

I cant find the exact diffrences anywhere... Also i cant find if the 730 supports bi-amping.

What to do?

Which to buy?

Thanks in advance for your opinion