Suppose I want to buy SSL certs for a domain, say xyzzy.com and three sub-domains (www.xyzzy.com, smtp. and mail. for example).  There seem to be several options: multiple single-server certs, a multi-domain cert or a wildcard cert.  This question has to do with technical reasons for choosing one type of cert over another.Currently the reseller I'm considering (NameCheap->Comodo PositiveSSL) prices certificates as follows (annual cost):Single server       9.00Multi-domain       29.00Wildcard           94.00So for a total of 4 names it would seem a multi-domain cert would be the minimum cost, and for fewer than 4 I should just buy single-server certs.Note that this is not for e-commerce or personal information, so extensive verification is not needed.Is there any technical reason for choosing something other than the lowest cost alternative?
Wildcard SSL vs Multi-domain vs multiple single certs
security certificate