I would agree with Spooled. ATL is going very junior for FO's, but who knows how long that will last... with the new pay rates I know of quite a few people who want ATL. I know of a whole class recently who bid ATL as #1 and none got it. Then a few weeks ago a few new hires got it.
If you don't like to work much, you'll like FO reserve in ATL. 25 hours is about average for FO's in ATL now. After about a month and a half of being here I got a high speed line with about 60 hours total... but that reserve time could change at any instant if ATL stops going so junior.