Yes, overall you have to make maximum quality back links. on the basis of that google assogn Page rank. does not matte you bought a link or a free one. but must be quality one & relevant to you niche.

above i saw a Nice List of web sites.
that's great.

there are few other like
www.adurl.com
www.coolseller.co.uk
www.worldwebdirectory.co.uk


soon will be compiling free directories list then i will post here.

thanks