Liriano is not top tier until he shows me he can be injury free which he has never done in his young career.
As HOOTIE said, I would put Felix, Lincecum with the top tier. Gallardo, Hughes, Billingsley and Buchholz should be near the top tier as well. Joba just behind those guys.
It really shows how awesome Kazmir is when you consider his great track record compared to these guys and on the cusp of absolutely breaking out.
"Think of how stupid the average person is, and realize half of them are stupider than that." ~George Carlin