Well, it's always a toss up between file size and quality. The only person who can really answer your question is yourself from the playing you are doing.

For example, the last time I answered a similar question I said that I find the WMV9 512K (or 1Mb) download preset within Media encoder to be good enough for the odds and ends I tend to want to share but it seemed this was nowhere near good enough for the person asking. Simply a case of horses for course I think.

If it's just a case of making clips available for family and friends then you can get away with some fo the presets but if it's for commercial use then I can understand you wanting to do better maybe.

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I'm not young enough to know everything!