As they say, and from my own personal experience, you can never have enough head-room. Not to mention the much improved sound quality you'll experience. So yes, absolutely, go with the H390, as it will "Knock your socks off.".
Hegel H160 -> Hegel H390 upgrade suggestion
Hi - I am driving H160 with Focal Electra 1008Be bookshelves with Rythmik F12SE sub woofer for the low end. I was curious if upgrade to H390 which is almost double the power that H160 provides would make any difference to my bookshelves for which H160 (power wise) seems adequate.