Just what do you mean??

TER has a pretty damm good list of providers.  Are you talking about reference sites?  Preferred411 and Date-Check are probably a bit more prevalent in the LV market than RS2K.

Not to mention, some of the ladies gave me tons of problems.

We have nobody like Cathy here in Vegas.  I've met clients through her site that have been using her service since the '80's.  She is a gem.

As Ol_Desperado said, P411 is probably the best place to find legitimate ladies by searching photos.  Unfortunately you have to become a member and it is about $89 a year, last I knew.

Probably your best bet is to spent the money and a bunch of time sifting through reviews on this site.  You can always make an ISO post here.  However, you will get a number of "pick-me" girls who reply to everything and a few assholes telling you to do some research.  You might still get a few good responses though.  
Tell my your type and I will tell you who I know personally who fits.