I'm really small time, so what's been working for me so far may not be applicable to what you envision, but I'm getting good organic paying traffic on my site, having only one site. I'm in the top 3 in most of my target keywords in my niche, top 5 in all of them, through strategic free advertising.
Depending on how broad your target niche is, having multiple sites spread around just for SEO purposes may be alot of work for very little reward. I know I'd rather have one kick ass site than spread around a bunch of ish just for google.
either way, I think your site is cool and I'd like to do a traffic trade with you, if you're interested. I sent you a message on ICQ, hit me back if so
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