Does anybody know of any sites I can visit that list providers?  I know of cityvibe.com which is good, but I'd like to see some others if they are available.

Joe you are going at it backwards.  Where you want to start is here on TER doing a search for the perfect girl you want.  Then go look at her pictures and see if she is to your liking.  Not the other way around.

If you start looking at all the pretty fake photos on so many escort sites (yes even the ones that say verified by eros or whatever) you are going to be back here writing a review of a rip off and your first line will go like this:

"I know I should have checked her reviews but her picture looked so sweet and voice sounded so nice I let my little head do the thinking"

Reviews then pictures - you got one of the most comprehensive search tools right here at your finger tips.  Use it!!

All I can add is if you want to window shop by pictures follow up by researching her reviews(if any)here. If the lady has no reviews defer any thoughts of seeing her until "several" appear. If the gal has only a few reviews and they are all by first time/one time reviewers consider this a red flag to being reviewed by her boyfriend/pimp/agency/shill.

Don't be "penny wise and pound foolish" Invest in a VIP membership and use it's information and features to your advantage.

your city and state name, there are a surprising amount of sites! As a provider, I've had great luck with Eros...they are professional and efficient. Every site you visit will have good and bad for you to choose from.
Remember to keep an open and intelligent mind. Just because a provider doesn't have reviews (I never used to even know TER existed, let alone the fact there were reviews of me on it), is not always as terrible as indicated...she may be like me-we have lives we would prefer to keep  seperate, as I imagine you do too!
I'm not for everyone, and some prefer a different style, or look, and you will find many different "kinds" of experiences, and women, in spend time with in this manner !!!!
Doing your homework doesn't hurt, but trust YOUR OWN instincts....I'm sure it will serve you well!!

It might save time as well. Many times the reviews will alert you to the fact that the photo is stock (*that is taken from the Internet and used widely to promote porn or adult entertainment*)
Another good suggestion is to read the discussion boards in your area and check the profile of the provider being reviewed. many times gentlemen new to the hobby will notice an experienced hobbyist who shares their taste in either a particular type of provider or a particular activity. With a VIP you can search that reviewers experience and get an idea of similar likes. (*you can also b/c ~or back channel~ that is send the reviewer a direct mail through TER and ask a specific question about a review. Usually most established hobbyist are courteous with sharing their experience if you approach the request in good taste*)