You're really not going to find a psychedelic that's totally "clear headed" because that's just whats psychedelic drugs are...they change the way you think, they way you experience reality.
Really the only recommendations I could make is the 2c family, which you say you've already tried 2ce which is my personal favorite. For me they're generally more stimulating and visual inducing then the mega-mind-fuck you get with other psychs. Also as sekio said, LSD is always a great choice, there's a reason it's the most popular psychedelic. However, buying street LSD you can never really be sure if it's DoB, some other rc, or what, and purity/strength are also hard to be certain of.