I am using the 3805 and I think it is great. As far as power goes I am pushing 60's qs'8 vp 150 and it far exceeds volume listening capabilities. I wouldn't let real life wattage sway you between the two models. I like many of the auto features of the 3805. I am not sure if HK has the same technology. I also think that HK is nice product. I was faced with the same dilema when I made my purchase. I dont think you can go wrong with either choice.
On a side note, I like the remote the 3805 offers. Easily it replaced all my remotes. Functions are easily understood by a man .
Both are contenders so dont beat yourself up with the decision.