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AOpen's are nice, they're actually rebranded Fortran units so they're pretty hardcore. Antec's aren't bad either, but I haven't used one personally so I can't really comment.
unfortunately the same cannot be said for the 700W and higher range... aopen has reverted to some chinese company for the higher range psu's... and I doubt there's much of the fortran ones going around...
I personally have been using the antec 550W true power 2, 550W true power Trio and 650W true power Trio is in my current system.
The 550W was the True power 2 which was a load of hogwash! It got too hot over utlized from a mid range pc... so it blew!
System spec for the 550W:
AMD 4200+
mobo,
2gigs DDR ram
2x250gig HDD in raid
x1900xtx
dvdrw
3x120mm fans
water cooling of 5V
my replacement was the 550W True Power Trio as the TP2 was phased out.
Spec that it ran this psu:
Intel C2D E6600
2gig DDR2 ram
3x250gig HDD
3x120mm fan
1x antec spotcool fan
dvdrw
watercooling of 5V
the PSU ran cooler than the TP2 and system was stable until I replaced it with the 650W TPTrio

650W overkill IMHO but hey I got it as a replacement value to the 550W TPTrio

however my electricty bill has increased R30/month now

if you wondering about the 12V rail of the antec true power 3 here's a spec:
watt 12V total watt
430 384
550 504
650 624
Here's the specs for the coolermaster realpower:
watt 12V total watt
550 360
850 720
850 720
see the 12V doesn't loose much ground compared to the likes of the DON'T EVEN BOTHER WITH THE COOLERMASTER EXTREME!
the Antec NeoHe is overpriced for the performace...