Guild Wars 2

So I bought my first piece of endgame gear yesterday. The 42K karma piece from a vendor in Orr. But I was wondering if the set is actually good, useful or worth getting if I don’t like the aesthetics of it (was planning to transmute it)?
Would it be better or easier for me to use crafting to get a max set I like than gathering Karma for 10 more months for the other pieces?
Also how hard is it to obtain Superior Runes of Dwayna? Cause that’s what I want on my set, but no idea how or where to get them…

Also, I was wondering where to get these two sets from.
I know this set is in the game, because I saw someone wearing it a few days ago. Originally I thought it came from the Twilight Arbor dungeon, but I found out that one gets you the Nightmare set. Anyone knows how/where to get this set from?
http://wiki.guildwars2.com/wiki/File:Light_armor_03_concept_art.jpg

Then there’s this set, only seen the concept art of it on the Wiki:
http://wiki.guildwars2.com/wiki/File:Light_acolyte.jpg
Is this even in the game? If so, where is it?