Well, rather than recommend a specific NLE I would say that, from your post, you've been through a few 30 day demos. So why not just buy the one you likes or got on with the most.

I appreciate that they are maybe demos of pro versions but the s/w providers often have cut down versions of their stuff. i.e. if you demo'd Adobe Premier Pro then and got on well with it then why not invest in Premiere Elements.

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I'm not young enough to know everything!