Need a good and reasonably priced Background check site

[DogFacedBoy]

I have a friend who is suspicious of a guy that she has started to see, including a possible alias (before you tell me to tell her to run in the other direction, I've already done that) She wants me to run a check on him.

I'm sure there are a few people here that have had to use a service like this in the past...any suggestions weighing both details and cost?

Also, anyone know of a reverse cell phone search that is affordable or subscribeable for unlimited searches with in a certain time period. How about searching a person's name to see if they have a cell phone?

Thanks