As many have said, I'd love to have Thibs if he's available, but I don't think he'll be available.
Other than that, I think SVG could be a great choice, but I think there is some risk with him. SVG did an awesome job with the Magic, but he was a guy who was always calling the plays, not letting the players decide, which is something I'm sure many players wouldn't like very much (admittedly, his Magic team was constituted by a lot of very high talented players but with little to no brain).
I think George Karl could be an interesting choice. He's had a few PO upsets against him, but in the case of Denver, I think the simple fact of being in a position to be upsetted is quite an accomplishment. He did do a great job taking the Sonics to the Finals one, it's just that those Bulls (with Phil as coach) were just better. I don't think he'd be a bad choice.
I don't like Jerry Sloan, I never liked Jerry Sloan and probably I'll never like Jerry Sloan. I just don't like the style of play he teaches.
JVG would be a nice choice. He's been out of the business for quite some time, but I think he did a good job with both New York and Houston.
Lionel Hollins would probably be a decent choice. Not the best, but certainly not the worst.
If we were to hire Mike Dunleavy I might get an urge to kill everyone on the Lakers organization. Going from Mike Brown to Mike D'Antoni to Mike Dunleavy would be the lowest moment of this great franchise (we should just make a rule that prohibits the hiring of anyone named Mike, just to be safe).
Phil or Pop would be awesome, but it's definitely not happening. Better not even think about this possibility
If Fisher retired and decided to coach, I would be happy to take the risk of hiring him as head coach. But I admit this is me thinking more with the heart than with the brain.