Unless you absolutely *must* buy modular, there's no real reason not to buy PCP&C anymore.
They are priced no worse than Antec, they remain single-rail, and they are actually available retail (I was in the Fairfax, VA MC last week, and was stonkered to find plenty of Silencer 500s on the shelf; right next door were plenty of the Silencer 610 and even 750 Quad models). Just three months ago, it was darn difficult to find *any* Silencer model in stock.
If you can afford Antec earthWatts, you can afford PCP&C. Even retail.