06-11 Civic Si seats are nice (good combo of comfort, style and function). But really heavy.
JDM DC2 ITR Recaros are famous and pretty comfortable but it's hard to find a pair in great shape. They're getting old. Black, red and I've seen some blue....maybe yellow? These fit with no modifications.
Sparco Evo US lll will take up to a 38" waist but they're about $800 a piece (FIA approved)