Looking to buy Prometheus Evolution or Aliens Anthology but:

[Easywolf32]

I'm looking to upgade my Aliens Quadrilogy DVD set to one of these:

Aliens: Anthology Blu-Ray set or Prometheus to Alien Evolution set or was thinking of simply get Antholgy and a Prometheus collector's edition blu ray and just saving money.

If I decide to buy the Prometheus to Alien Evolution set here: is there a chance that it's a pirated version? It says region free as well...http://www.ebay.com/itm/Prometheus-t...item5aecf53f6c

Does the Anthology set and the collector's Prometheus Blu ray have the same content as the Prometheus to Alien Evolution set?

Thanks.