First time build, Z68, retiring my Pentium II

Greetings,

You can stop laughing, yes, still using my Dell XPS Pentium II with 256MB of ram and Windows 98. It just keeps going and going. This replaced my 10 year old Dell XPS Pentium 120 (came with 16MB of ram and a 1GB hard drive), same story, never died. The original 1GB hard drive from 1996 is in the current machine, it's 15 years old and still going.

Primary use for new pc will be:

Photography - Lightroom 3

Perhaps some video editing in the future

I would like to run a normal speed most of the time but be able to overclock with the click of a button to batch process images, I think this is the ASUS auto tune.

No games

Never done this before, tell me if I am doing something stupid  

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Case - COOLER MASTER 690 II Advanced Black Steel ATX Mid Tower Computer Case

MOBO - ASUS Z68 Pro

PSU - Seasonic SS-560KM Active PFC F3, 560W ATX12V V2.3/EPS 12V V2.91, 80Plus Gold Certified, Modular Power Supply

CPU - Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost)

CPU Cooler

Antec KUHLER H2O 620 CPU Cooler
or
COOLER MASTER Hyper 212 Plus

Memory

CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) latency 9, timing 9-9-9-24
or
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) latency 9, timing 9-9-9-24

Storage (system) - Intel 320 Series SSDSA2CW120G3K5 2.5" 120GB SATA II MLC Internal Solid State Drive (SSD)

Storage (data) - SAMSUNG Spinpoint F3R HE103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive

Microsoft Windows 7 Home Premium Full 64

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I'm still not clear on what memory to get other than 1.5v.

1) If the ASUS auto tune overclock goes to 4.4Ghz, what do I need for speed? 1333, 1600? What about latency? 8, 9, 10?

2) Is there any point going with more than 8GB?

CPU cooler

3) I'm not sure if which has the advantage, air or water, when dealing with high ambient temperatures. When it's 115F outside my a/c will get me down to 82-84. I'm fine with it but I need a cooler that can cope with it.

SSD wear and tear.

4) If, on a weekly basis, I load 1GB of files onto the SSD then erase them, how would that affect the lifespan of the drive? This would be for batch processing images.

tia