You might enjoy Logicomix: http://www.amazon.co.uk/Logicomix-An-Epic-Search-Truth/dp/0747597200 (single thick-ish graphic novel) Personally I think Transmetropolitan is unbeatable as comics go. Gloriously dystopian sci-fi/politics shenanigans: http://www.amazon.co.uk/Transmetropolitan-Vol-1-Back-Street/dp/1401220843 (11 graphic novels, including the optional #0 prequel thingy)