The following are what I use as reasonably good yet conservative values for DNS blacklisting and RHS blacklisting. Comments?
RBL: zen.spamhaus.org:whois.rfc-ignorant.org:dnsbl.njabl.org
SBL: bogusmx.rfc-ignorant.org:multi.surbl.org:black.uribl.com:ex.dnsbl.org