Neutral to me means things sound like the real thing. Voices sound like the person and instruments sound like how they sound if you were sitting next to them. unnecessarily warm comes across to me as muted highs and the feeling like you have cotton in your eyes while listening to the music. Could also means everything is recessed. Bright to me, means harsh highs and very forward upper midrange, usually combined with excess sibilance.
If the Neotech gold have a bit more attack than the Furutech, that is probably a good thing. Now it is just a choice between the Neotech gold or rhodium...