Zeppelin IV and Physical Graffiti. Doesn't get any better than that for my money.
Can't go wrong with those ones. Physical Graffiti is definitely my favorite LZ album and one of my very favorite albums of any genre.
My personal LZ ranking:
Physical Graffiti > Houses of the Holy & IV > III & II > I > Presence > In Through the Out Door
Fans of The Black Keys should check out Black Pistol Fire who are a 2-person group playing a pretty similar style of energetic and riff-centric garage rock. Here is "You're Not The Only One" (from their self-titled) and "Slow Burn" (from Big Beat '59).