Yup, I've got all four of Celly's solos. All are worth picking up, but my personal favorite is probably KILLA CALI (1995), which have Celly's tightest concepts and lyrics, and it even had a hit single (so to speak) w/ "It's Goin' Down Tonight." (the video for that song even got some pretty good BET airplay as I recall). I'd get that one first...
PEACE!