Antec had reliability problems in the past. I don't know if they had resolved the problem. For the corsair PSU's, both the TX650W and TX750W are great and will run your system without issues. Here's a great review of the TX750W Corsair TX750W Power Supply Review | Hardware Secrets.
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Leclerc
AthlonX2 4600+ @ 3.0Ghz (tweaked by Ebdoradz) | Gigabyte MA790X-DS4 | 2x1GB Mushkin HP PC2-6400 @ 860Mhz | Silverstone Strider 500W PSU | Palit Radeon HD 3850 @ 720Mhz/1.76Ghz on 22" Acer X223w monitor | Thermaltake SopranoRS 101 | 1 x Seagate 250GB
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