Flaminius: As far as I know, [ŋ] is a trait of Tokyo dialect (I don't know whether Yamanote or Shitamachi, or if it comes from a different subdialect), and therefore, as Tokyo dialect is the basis for the current standard Japanese, I assume [ŋ] can be considered a part of the standard pronunciation, (or "normative", as you've said yourself). Furthermore, this [ŋ] sound is mentioned on textbooks for foreign students, or at least on the textbooks I have, some of which are not exactly what we would call "old" or "outdated".
As for considering this pronunciation "elegant", it's an opinion which I've found on other discussion forums, also stated by native Japanese speakers, see for example comments on this site:
http://forum.koohii.com/viewtopic.php?id=5857
Don't worry about this too much. Here's the real difference:
Both are completely accepted. However, if you would like your Japanese to be more respected with the older crowd and if you want your Japanese to carry a sort of regal elegance, pronounce the g like [ŋ].
This has been explained to me in great depth a number of time by various Japanese people. While all of them agree that it is a kind of... "high-class" way to pronounce the g, some thing that it is good it is dying out amount the younger crowd as it sounds rather stuffy. While others, such as the case with my friend and her mom, think it is the high of tragedy that this pronunciation is dying and have attempted to get me to start using it (at which I usually fail).
Anyway, I'm not a native speaker of Japanese and of course I may be wrong about this, or, rather that "wrong", possibly what I'm saying may not be a generally widespread way of considering this point. I guess it mostly depends on every single person and the way everyone handles and sees the language.
Personally, I'm able to pronounce and understand [ŋ], but I seldom use it when I speak in Japanese, I always pronounce a normal [g] even when it occurs in intervocalic position.