My favorite is Agua Lavanda Puig. It's not a pure lavender, but very nice...clean and classy. I understand that it's not nearly as strong as it used to be, which is a shame, but it comes in giant bottles that make it a pretty cheap investment. IMHO, the current ("weak") splash is perfect as an aftershave. I just wish Puig still made the full-strength cologne.
People tell me Speick aftershave has lavender along with the primary herbal. I'm still researching and intend to develop a nose for primary notes so I can't say with any certainty yet.