Which one you think is the best one to get? 19cm in most cases. 21cm and 17cm do have their fans though. How is the fit? Great? Are they TTS or do I size down? My measured waist is 30. Size down. 1-3 depending on how tight you want it. Lastly where is the best place to buy them for the cheapest price? The cheapest would be to go to the Dior Homme store and pick them up there. Otherwise the only retail choice is Barney's and you will not find a size under 30 in any store across the nation. I can verify this since I was at Barney's yesterday and the guy checked for a customer earlier. That leaves you with a few choices, I know TheGrapist at superfuture runs a proxy service for Dior Homme, the total coming to about $400 dollars per pair of jeans with shipping/proxy fee/etc.