85W or 60W MagSafe power adapter?

I'm buying an extra power adapter for my MacBook to use at the office.
Both the 85 watt MacBook Pro and 60 watt MacBook power adapters have MagSafe on them. They are both the same price. Should I consider the 85 watt adapter for my black MacBook? I was thinking that I could get the larger wattage version so that I'm not fully taxing the unit, allowing it to run cooler and potentially prolonging the life.
I know this is kind of an off-the-wall question, but I'm curious about these things. Any thoughts are welcome.

It's easy these are very good instructions on How to Upgrade Your MacBook's Hard Drive.
Here is the Apple Apples DIY hard drive replacement instructions.
The only step they left out is the need for a number 8 *Torx Driver* to swap a shield from the old drive to the new. Apples DIY Warranty Info
I bought this drive.
Western Digital Scorpio WD3200BEVT 320GB 5400 RPM 8MB Cache SATA 3.0Gb/s Notebook Hard Drive - OEM
I also bought an enclosure to put my old 80 GB drive in and used it to recover my system with. It also is now used for storage. No sense wasting good drive:->
OWC Hard Drive Enclosures
These are are good sources.
OWC MacBook Ram and Hard drives
NewEgg.com LapTop Hard Drives

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