You're aware that the NeoHE series and the Corsair HX series are both manufactured by Seasonic right? And that they are physically very similar, except to the sticker and a small difference in amps here and there.
Both are top notch units, I should know it, I own an Antec NeoHE 500 and believe me, you'll be fine with the 550, especially if you don't plan on using any decent video card (I'm powering a GTS-320 system and still got a lot of current to spare). The Antec NeoHE 500 has 38A on the combined 12V rail, The NeoHE 500 and 550 are both very close to the Corsair 520HX. And antec also released a PSU to compete with the Corsair 620HX for the NeoHE line up which is the new Antec NeoPower Blue 650W. All of these units are manufactured by Seasonic and put different stickers by each company, so I really don't see why you believe that the corsair HX is superior to the Antec NeoHE. The TruePower Trio however, is a very different line up in the antec series.