My RAM Trilemma for the new 27" iMac

Hello everyone.

I am stuck in choosing what RAM i should buy when i get my hands on a new 27" iMac:
-3.4GHz i7
-1TB Fusion Drive
-GTX 680MX

I have decided to upgrade the RAM myself to 32GB 1600Mhz.

I have 3 choices and i can't make a decision on what would be best.

OPTION 1: - Mac Memory
2x Corsair 16GB CMSA16GX3M2A1600C11 - (2x8GB) Mac Memory, 1600MHz DDR3
@ $141 a piece = Total of $282

OPTION 2: - Mac Memory
4x Kingston KTA-MB1600/8GFR 8GB DDR3 1600MHz 204Pin SODIMM Retail Apple Memory
@ $62.50 a piece = Total of $250

OPTION 3: - NON-Mac Memory
2x Corsair 16GB Vengeance SODIMM RAM (CMSX16GX3M2A1600C10)
@ $109 a piece = Total of $218

Note: All prices are AU (might be slightly higher than US prices)
Any feedback would be appreciated,
Cheers.

Thanks everyone for your recommendations. I'll have a closer look at crucial. But i'm thinking of going with the Corsair Mac Memory (just to be safe) and I've had corsair products in the past which have been great. (and because i can get it locally)

Still have a few weeks to think about it.