On finding a real estate agent

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I was writing down some questions that I'm going to ask to prospective real estate agents. I'm going to make sure that the agent is totally aware of my buying requirements and the fact that when I submit an offer through him/her that it will normally be low but eventually one or two offers will be accepted. I was going to posture that I would allow the agent I purchase through also do the listing after it is rehabbed and ready to sell.

Then I got to thinking just because the agent is capable of providing me with a list of prospective properties that meet my requirements on a regular basis and submitting my offers doesn't mean he/she will be an equally capble selling agent. Some of the top selling agents I'm sure aren't going to be as easily accessible because they are busy selling and not pulling distressed property lists and submitting offers to purchase. But on the other hand it seems that by going to one agent to buy and another agent to sell it will catch up with me in the end and probably have less than lackluster relationships with the agents.

Does anyone use two different agents? I would think that practice would be frowned upon.