Hi EDA_hg81,
Pow*er*P*CB (5.01 not other) are good, 2004 have some new features, but the main difference are on bug fixes in 2004, latest release.
The Binary files generated from each version Pow*er*P*CB (5.01) and 2004 layout are backward and forward compatible, for logic and layout.
For me is a very good choice in starting to manage h-speed signals. Other very good tools for SI manage are Exp*edition, but not simple to learn, and expensive, the same for Allegro. Pow*er*PCB are moore cheaper and simple to learn, but fine.
skywalker.