Great band, good classic rock and had a fine lineup - I really enjoyed their 1974-1980 period, so I'd point you towards the "Obsession" album from 1978 which had some great tracks on it and the next one out, "No Place To Run" which had the charting "Young Blood" (memories of a red vinyl 7" single with that one) and the brilliant Mystery Train which took the old 50s/Elvis number and piled on the power.
They lasted for a year or two beyond that but Michael Schenker and Pete Way left around 1983 to form their own groups (Michael Schenker Group - MSG and a shortlived outfit, Waysted, the former enjoying far more success than the latter). The band continued on with singer Phil Mogg at the helm of an ever changing lineup. Great band and one of the first bands I got into at the time.