I need a new PSU... Advice
Which case do you have? I don't think your case has as many options as mine, here is the cable management system on my case.
About modular power supplies - that myth used to be true a while ago. Modular power supplies were somewhat unreliable. They still are less reliable, but the difference in reliability is negligible. Modular power supplies also have less potential efficiency, they're larger, and have less available space for fans and ventilation.
That OCZ PSU you linked us to seems like the best choice for you. Very cheap, modular, a good brand, and 80 Plus Certified. I say go for it before the rebate disappears.