Reddit mentions of Flash Gold (The Flash Gold Chronicles Book 1)

I loved Stephen Baxter's Anti Ice and his "sequel" to H.G. Wells's The Time Machine called The Time Ships (both a more "hard sci fi" take on the genre).

I'm also really digging Lindsay Buroker's novella series set in the Yukon that starts with Flash Gold (the first one is free)

Michael Coorlim's series is also quite good: And they called her Spider (and the first one is free as well).

I've not yet read Michael Moorcock's The Warlord of the Air but I hear that is also pretty excellent.

EDIT: For a kind of more out-there (but tons of fun) steampunk, check out Michael Forstchen's Lost Regiment Series (the first book is Rally Cry) about a Civil War regiment transported to an alien world where the natives raise and eat humans as cattle. The steampunk doesn't really show up until the 2nd or 3rd book, but a very engrossing series.