You should not experience any problems with overclocking.
Competent technical reviews of the Antec High Current Gamer and High Current Pro power supplies were very favorable. They made the PC Power Supply Recommendations list:http://www.johnnylucky.org/power-supplies/psu-recommendations.html
Scroll down to the Antec section and follow the links to the technical reviews.
djangoringo - I suggest holding off on Corsair TX series. It looks like Corsair switched OEM's again. Previously the TX series psu's were made by Channel Well and SeaSonic. It now appears both OEM's have been dropped in favor of Chicony Power. No technical reviews yet but forum threads suggest the new TX psu's made by Chicony use cheaper capacitors. We'll have to wait for competent technical reviews. In addition, it looks like Corsair has discontinued most of their older model series, including the HX series.