I would go to Paris! Not sure where you are from, but with the weak Euro compared to the US dollar and the VAT refund, prices at Hermes were waaaay lower than in the US or UK. Not sure about Celine, Chanel and Dior. When I looked up pricing for Loewe, it was the same everywhere that uses the Euro. If you are looking for something harder to find, I would go to Paris for French brands for the best selection. Otherwise it might not matter as much.