5400 versus 7200 rpm firewire disk: does it matter?

I'm in the market for an external firewire drive. The model I'm considering (LaCie Rugged Hard Disk) comes in 5400 rpm and 7200 rpm versions. I will be using my iMac G5's FireWire 400 connection. Given the transfer speed limitations of FireWire 400, will I see a difference between the 5400 rpm and the 7200 rpm models?
I will typically use Retrospect to backup my entire hard disk, and Synchronize Pro to synchronize folders between the external and internal disks.
Thanks.

Probably not with 400 transfer, however if you want to upgrade your computer later to an intel with 800 Firewire, you might be glad of the greater speed.

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