If you decide on a DVD or Hard Drive camcorder I recommend against any Adobe editing product. You can try Sony Vegas or one of the Ulead products, they handle the mpeg and AVCHD files much better.
As to Mini DV, professionals in the film, television and cable industry are still using MiniDV and DV tape. They will not be changing anytime soon. Also, High Definition still records to MiniDV tape and that will be around for a long time to come. Don't think that the format is going away anytime soon
As for camcorders, I don't think there is anything better than the Canon HV20 for quality and price, at least right now.