Well shit. I was going to recommend the works of Brin, Bear, Hamilton, KSR etc, but I can see that you've been there, done that, and got the t-shirt already! 
Alternate-history-wise, perhaps Harry Turtledove?
As a fan of Alfred Bester, I'd also recommend The Demolished Man and The Stars my Destination.
Also, perhaps Ben Bova?

Alternate-history-wise, perhaps Harry Turtledove?
As a fan of Alfred Bester, I'd also recommend The Demolished Man and The Stars my Destination.
Also, perhaps Ben Bova?