The Derek Trucks Band’s album Joyful Noise (2002) is a true slide guitar fest. The Allman Brothers At Fillmore East (1971) is a great example of slide phrasing. Sonny Landreth takes slide to new places; try From The Reach (2008), particularly the track Uberesso. Warren Haynes is not only a fantastic slide player but also most likely to be found in standard tuning. Check out his band Gov’t Mule.