for procuction domains or names you want to sell through moniker live auctions use moniker.com
very secure and yet affordable if you get the special deal
for tons of domains to trial and error with and see how it goes in the first year parking, etc. I use 1and1 - can't beat $5.99/year with free whois protection, dns, forwarding etc.
you can look for available domains and register them through my search interface on
DomainKaiser's Premium Domain Names - $5.99/year No Limits.
I also list my aftermarket domains for sale on there and selected auction links.