Domain Trader is for creating a marketplace, i.e., Sedo. It mirrors Sedo in most functionality. And thats why it's expensive. And if thats what you are looking to do, then yes, DT is really the only option.
If you're just looking to make a personal portfolio site, there are a few free/cheap scripts out there including www.domainportfolio.us which someone recommended above. I use this script on NameTicket, though I have modified it a bit.