Quick Realtor Question?!?

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Is it ok to work directly with the Realtor who is selling an REO property and have them pull the comps on it, or is it better to work with a different realtor so they are not "biased"? Or does this not matter because of their code of ethics?
Also the property is a bank foreclosure that they said will not be on the market for another 2 weeks. I told them that I wanted it as an investment property. She asked if it would be a cash deal or financed, I told her it would be a cash deal (in this case) and that I was hoping for a quick turn around.
Is there anything else I should be asking, or am I asking too much before the house goes "on the market"? It was a vacant house that I had seen while "driving for dollars".

Maybe not such a quick question after all....thanks for your input.

8) LONNIE 8)