Who would have played John Wick better than Keanu?

I've just watched John Wick for the second time and I enjoyed it just as much second time round as the first. I love revenge/justice type films and I think this was well executed, if you pardon the pun.

My main gripe about the movie, however, is the lead actor. I didn't find him to be particularly convincing as John Wick.

Maybe he's too skinny or un-menacing or not psychotic enough. The best bit was when he stabbed the guy and stared intently as he watched him die. Other than that I found Keannu to be slightly weak as the main role... particularly as the reputation and legend that is John Wick the character was built up magnificently all the way through the movie.

I'm racking my brain to think who would have been perfect for the role and have come up with these suggestions:

Jim Caviezel (Mr Reese in Person of interest - just the right amount of menace/professional hitman/one man army about him, and despite being 4 years younger than Keanu actually seems older)

Tom Cruise - what he lacks in muscle he makes up for in psychotic nuttyness. Just needs to channel his inner Thetans and kapow!

Any other credible suggestions?