There are some hosting co. that offer different class-c ip from one hosting acct
if you don't want to bother with many different hosting co.
Just Google it 
Be sure to match "anchor" text.
MinorKeyword1.com has link to
http://Your-Main-Site.com/MinorKeyword1.html
example on MinorKeyword1.com pages - link should show "Minor Keyword1".
Link title - Minor Keyword1
Most popular mistake - Click here for more info