New domain plural .com or singular .net which is best for SEO?

Hi.
Say I wanted to start a for instance twitter guide shop and the domain twitterguide.net is available, not .com but twitterguides.com is still available.

Which would be better for ranking for keywords twitter guide (main) and twitter guides (secondary keyword)?

I would be very grateful for any help I can get, have been wondering about this for a while now.

Thanks.
kikkoman.

And is there any value for one word dictionary names with other extensions like .tel and other geo ones like .eu .be .fr etc. And please give a comparison bw .net and .com plz... And how to get rid of trademark domains.
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Compare the amount of searches the terms get - if there is a large difference between the searches for the single and plural then get the one with more searches - if there is not much of a difference then I guess it's personal preference really - I feel .coms have better brandability and type in traffic, but then again the singular .net may sound better, so people will remember it easier resulting in more returning traffic plus it is your main KW.

For SEO, i find that google ranks .net/.org's the same as .com's. So if SEO is your concern, it wouldn't really matter if you got a .net/org/com. However those who are typing the url of the domain in the address bar, might type in .com as it's more widely known.

Personally i would go for the exact keyword in my domain (in your case twitterguide.net) as i'd reckon that most of the traffic of new sites will come from the search engines anyways.

Oh and you might want to get it quick as you posting information like this (your domain target) is a potential for others to snap it up instead. But i think that you're smarter than this and used sub names instead of your real targets