RockMelt

Personally my only advantages in using opera are;

Opening bookmarks by keyword (including multiple bookmarks at once)
Tabbed browsing with the ability to lock specific tabs so you don't close them accidentally (although it won't prevent you from closing the entire set of tabs via the window, which is stupid to me and it's one real gap in this feature).

Soon as chrome can do those without an extension or having to write it myself, I'll probably ditch opera.

I don't get what you mean about opening bookmarks with keywords - chrome can do the same. if I bookmarked this site, or even visited it often, I could just type out "sou-", and then I would get an instant suggestion of going here.
and the tab locking feature seems pointless. right click > re-open closed tab.