I love pretty much all songs by Tim McGraw, Toby Keith, and Josh Turner. There are some songs by Kenny Chesney and Brad Paisley that I like too.
Going back farther, you've got emmylou harris, george jones, johnny cash, tammy wynette, etc. If you want to go really country, check out some stuff from really back in the day like Marty Robbins (he's got a lot of gunfighter and cowboy songs that I absolutely adore) and Bob Wills. THAT's country music.