Hi! My mixed team is 60 as well.
Warrior, Priest, Mage, Warlock and Hunter.
Horde - Mirage Raceway EU.

The leveling route was following:
1 Durotar
10 Barrens
14 RFC
18 WC
22 SFK
26 RFK
30 SM GY
32 SM LIB
36 SM ARM
40 RFD
41 SM CATH
44 ULDA
45 ZF
48 MARA
49 Jintha'Alor
50 BRD
58 LBRS