Yep, for the wheel just get your boss first (can recommend Whifbitz, but plenty of other places too). Then take your pick.
Likewise for the seats - just pick what you want then check they have the right subframes for the car. if they don't you can always hack them about until they fit Recaro & Bride are good options with the right subframes, although I *think* Cobra have specific subframes now too.
Purely down to budget and taste, at the end of the day