Power Supply Help!

Hi, I'm almost at the finish-line to completing my build, but I need help on the PSU.

1. First of all, is there a difference in performance between a modular PSU, a semi-modular PSU, and a non-modular PSU?

2. Is an 80 Plus Platinum PSU or an 80 Plus Gold PSU worth it?

3. If I go SLI or Crossfire, do I really need 1000+W?
    Here's my build:
       CPU: Intel Core i5-3570K
       MoBo: ASRock Z77 Extreme4
       RAM: G. Skill Ripjaws X Series 8GB DDR3-1866
       SSD: Samsung 840 Pro Series 128GB
       HDD: Western Digital Caviar Black 1TB 7200RPM
       GPU: Sapphire Radeon R9 280X 3GB
       PSU: ?
       Case: Corsair Carbide Series 300R ATX Mid Tower
       CPU Cooler: Noctua NH-D14
       OS: Windows 8 64-bit

4. Can you suggest an excellent PSU for this build? I'm trying to go as cheap as possible...

Thanks a lot, and sorry for asking loads of questions.
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  1. Best answer
    1) There isn't a difference, just a personal/ascetic preference. Modular is where all the cables can detach if they aren't needed, semi-modular is where the necessary cables are attached permanently, and the extra cables are modular, and non-modular is where everything is attached.

    2) Yes it is. You save more energy that way. Eg, A 1000w PSU takes 1000w from your wall, and then looses a bit of it before it is transferred to your pc, so you are actually getting 997. Gold looses less power, and so on down the line.

    3) Yeah go ahead and get 1000w. Never cheap out on a PSU. Cheap units will fail and possibly damage your system. For a list of all the PSU makers, ranked 1-5, go here.

    4) XFX ProSeries 1000 or 1200w.
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