Take a Look Over Your Shoulder isn't an amazing record as a whole, but it has some of my favorite all-time Warren songs on it, like "Transformers" and "Relax Your Mind", it was also the last of Warren's cd's to feature Malik or Tha Twinz, if I'm not mistaken.
I Want It All is probably Warren's strongest solo record, as he's finally rapping on every track (even though Regulate is DEFINITELY a better record). "I Want It All" is probably one of the two most well-known Warren songs, and "Gangsta Love" and "Dope Beat" are two of the best beats I've ever heard him do. The only real missteps on the record are the tracks w/ Drag-On on them. Last record with the 5 Footaz on a track.
Return of the Regulator is definitely the weakest record, but that doesn't mean there aren't good songs. "Yo Sassy Ways" is what a 213 track SHOULD sound like, "Here Comes Another Hit" is another good track, but it seems like Warren ditched a lot of his signature sounds on that record.