Dual is fine as long as the the amps are adequate on both rails. The Antec 480 TP 2.0 has (18+18) which is a great amount of power. My Antec 480 NeoPower has (18+15), and the Fortron Blue 500 has (15+15) and it powers many DFI Ultra-D nF4's wonderfully.
The NeoPower I own works as follows:
12v1...18a....powers the main ATX, peripherals, floppy, SATA
12v2...15a....dedicated to the 4 pin ATX (which is the main CPU feed)
Motherboards that don't have a 4 pin ATX connector will leave you with a one rail PSU, that is the danger. But most high end boards these days have both. I would say that 18a on 2 rails is a very powerful psu. That Antec 480 TP2 looks awesome for $100. The TP2 series looks wonderful, if they are as good as the Neo, there won't be alot to worry about....
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