The Studio Albums 1972-1979 will collect exactly that: just about the entirety of the band's discography (not counting any non-LP tracks, either live album, Eagles Live (1980) or Hell Freezes Over (1994), nor most recent studio album Long Road Out of Eden (2007)) on six CDs. As with previous such Rhino boxes, it's expected to have no different mastering than prior CD releases (likely the same masterings by Ted Jensen at New York's Sterling Sound that were issued on CD in 1999), nor any other extra frills.
But again, if you don't have any of these albums, now's as good a time as any to pick this up - which you can do, in stores starting March 19 or at the Amazon links below.
The Studio Albums 1972-1979 (Elektra/Rhino 534728, 2013)
Disc 1: Eagles (originally released as Asylum SD-5054, 1972)
Disc 2: Desperado (originally released as Asylum SD-5068, 1973)
Disc 3: On the Border (originally released as Asylum 7E-1004, 1974)
Disc 4: One of These Nights (originally released as Asylum 7E-1039, 1975)
Disc 5: Hotel California (originally released as Asylum 7E-1084, 1976)
Disc 6: The Long Run (originally released as Asylum 5E-508, 1979)