Biodiversity in the sense of not putting all your genetic eggs in one pool.

Also, it is sometimes easier not to terraforming the planet to fit life, [url=http://freefall.purrsia.com/ff800/fv00710.htm]but to bio-engineer the life-form to fit the planet.[/url]

As long as resources are utilized efficiently and not squandered, there's more than enough to make a virtual confederation of galaxies.