Currently there are about 100 games supported by vorpX, almost every major current first person game that makes sense in the Rift is on that list. If you own all these games, you shouldn’t have to think twice about the cost of vorpX. :) vorpX also works with many more games than those that are mentioned in the compatibility list, the only thing missing in these games is S3D. If you feel any major game that is well suited for VR is missing, please let us know in the wishlist thread above.
The next update will have about 20 new games supported, focusing on smaller titles that work well in VR and the very few bigger releases that came out since the end of the last year.
DK2 and the future consumer version of the Rift will obvioulsy be supported, we ordered two DK2s on the day the annoucement was made. Please keep in mind that the Rift is still very much a beta product, and so is vorpX. The release date of the consumer Rift is our target date for version 1.0 of vorpX, but of course there will be several vorpX updates before that.