Those are the PSU avaible for me and at a good price too. Also at the same price as the M12II is the TX 750W V2 from corsair.
I will be powering :
I3-2120 G.Skill Ripjaws x2x4GB 1600 Mhz (Blue) H77 Pro4-M Cm 690 II Advanced Usb 3.0 HD 6850 (Soon) Hyper 212 Evo (Push Pull Blue LED Fan) 4x160 GB WD OCZ Agility 3 90 GB (Soon) 2x 12" Blue Cold Cathodes 6x Blue LED Fan\\\'s 140 MM
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All of them are plenty for your rig even the Antec 520. Since it is new you should have no problem with warranty I say go for it
I really wouldn't recommend you getting a used power supply!