I'll echo almost all of these. The only one I'll send a red flag on is the Pancake Pantry. I've had some killer breakfasts there, but they recently got a sub-60 score on their metro health inspection, so buyer beware.
Trendy hotspots include the aforementioned Whiskey Kitchen and one of its sister restaurants, Virago (upscale sushi), located on 12th Avenue South between Broadway and Demonbeun. Another related (same owner) upscale steakhouse called Kayne Prime has now opened just a block down the side street between those two places.
Other hotspots include The Gulch, which is just further south on 12th Ave (restaurants include upscale Mex in Cantina Laredo, flatbreads and cocktails at Urban Flats, and jazz bar/restaurant Sambuca). Midtown is bar/sports bar central - Red Door, Loser's and its counterpart, Winner's, Broadway Brewhouse, Tavern (a little more upscale - same owner as Virago/WK/etc).
As for downtown on Lower Broadway, don't miss the Legends/Tootsies/Robert's trifecta of honky tonks; take a tour during the day of the Ryman Auditorium or even the Country Music Hall of Fame (a block over on Demonbreun). As for eats, there are sports bars, but I'd recommend The Palm or Merchants.
Lastly - if you're looking for non-honky-tonk music @ night, check who's playing at Exit/In (near Vandy), 12th & Porter (just north of Broadway on 12th Ave), Mercy Lounge (off 8th Ave South), and for great bluegrass, Station Inn (in The Gulch area).
Hope that helps. Any questions feel free to send a PM.