Nice! I have a 520 and love it! Even spoke to the Trek Rep for my area about it and he said that it's one of the best bikes they make. Over 25 years in production for a reason. (The first year for the 520 was 1983.) Welcome to the "520 club."
So many choices in panniers and other gear have wonderful fun! The 520 is a blast for commuting, climbs hills like a beast. Many happy long rides to you!!!! Touring bikes are all about the adventure, baby!
"Things look different from the seat of a bike carrying a sleeping bag with a cold beer tucked inside." ~Jim Malusa
2009 Trek 520-Brooks B-17 Special in Antique Brown
2010 Surly Long Haul Trucker-Brooks B-17 Standard in Black
1983 Fuji Espree Single Speed-Brooks B17 British Racing Green