A while back I used Dropbox myself but it's ugly, unbranded and clumsy at best. I was looking to somehow integrate a distribution from my site (Wordpress at that time) and wasn't satisfied with many of the choices as I was also looking for fulfilment for prints. I checked out a few and finally settled on SmugMug. I'm at the first payment tier (not the pro) and while I can't do multiple price lists (which would be nice and maybe in the future) it does give easy access to customer files within a few clicks. Folders can also be password protected to keep unauthorized access. A nice feature for boudoir clients.
I have to say, their online design process is a bit clumsy but once you get the hang of it making changes becomes easier. You can click on the first link in my signature line below to see how I use their service for portfolio, clients and general event photography.
Hope this helps.
While I deliver RE images via TourBuzz, for many other purposes, I use ShootProof. Unlike Smugmug, ShootProof does not charge a commission on sales and I can sell images for cost or give them away if I want without paying an additional fee to ShootProof. The cost is reasonable, the website is clean and easy to use for both me and my clients, and the only additional charges I get are for credit card fees.