IANAL
Since you wrote the code you would have the copyright for it. (unless you were under a contract to another party that gives them rights to your work)
You can licence it in any way you like, even licencing it diffrent ways to diffrent people. So you can release it under a Open Source licence, and sell it, with or with out source, to any one you like. But, if you take any patches or code from any one you should prabably assume that it is under the same licence as you relased your code under and that, unless they have explicetly asigned you copyright, they hold it on that portion of code, and you can not relicence it to sell it with out source. Some licences incude terms in them that allow loop holes for the originator of the program though.

Developers should always be allowed to pick how and when there software is distributed.

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