Need advice on new hard drive for Time Machine, and have Firewire questions

I have an Intel iMac 2.66GHz with 500GB internal drive. I am going to buy an OWC 1TB drive to use for Time Machine.
I also have an older 160GB external drive with Firewire 400. I'd like to continue using it for extra storage, and would like both the iMac's internal drive and the 160GB external drive to be backed up to the new drive.
OWC's 1TB drive is available with Firewire 400 & USB 2. For an additional $30, it will also have Firewire 800. If I get the Firewire 800 drive and daisy-chain the iMac > new 1TB drive > old 160GB drive, will the iMac to 1TB drive run at 800, or will the 160GB drive's limitation of Firewire 400 pull the speed of the whole connection down to 400? (If the latter is true, then it would be a waste of money to get Firewire 800.)
Also, will it make much difference whether I use Firewire 800 or 400 for a drive dedicated to Time Machine?
Finally, the 1TB drive with a 32MB cache costs $20 more than one with a 16MB cache. Is a 32MB cache worth the extra expense for using with Time Machine?
Thanks!
Message was edited by: Patrick Houlihan

Patrick Houlihan wrote:
If I get the Firewire 800 drive and daisy-chain the iMac > new 1TB drive > old 160GB drive, will the iMac to 1TB drive run at 800, or will the 160GB drive's limitation of Firewire 400 pull the speed of the whole connection down to 400? (If the latter is true, then it would be a waste of money to get Firewire 800.)
I believe it will operate the entire bus at the slowest speed, but can't say for sure.
Finally, the 1TB drive with a 32MB cache costs $20 more than one with a 16MB cache. Is a 32MB cache worth the extra expense for using with Time Machine?
I went with the cheaper, smaller cache OWC drives for my backups on the theory that if caches speed repeated access of the same data, and a backup is always a single-pass stream of non-repeating data, then with a backup the data that goes in the cache doesn't need to be fetched again and therefore the cache isn't much help for backups. I'd love to hear if that's true.
I didn't answer the one about FireWire 800 for Time Machine because my Time Machine backups are over the network to Time Capsule. However, having a faster Time Machine drive interface should be faster. FireWire 800 certainly speeds things up for non-Time Machine backup software like SuperDuper which I also use.

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