RAID0 Question: Differing Hard Drives?

Hey guys. I'm looking for some support in this and want to see if this raises any red flags with anyone.
I am running a Mac Pro 2008 and I current have the following hard drive installed:
320Gb SATA 7200rpm 3Gb/s 3.5" internal, 8mb cache.
I am looking to install a second identical hard drive and RAID0 them, to improve overall performance. I'll likely back them up to a third 1TB hard drive using time machine.
The hard drive I am looking at is identical in ALL stats, EXCEPT it has a 16mb cache instead of an 8.
Could this relatively minor detail prove troublesome in raiding the drives? Should I seek to purchase a hard drive with 8 megs cache? Or does it not matter.
Any help is welcome. Thanks!

Two reasons not to go forward.
Those aren't going to be the same make/model/firmware "DNA" and you can find current drives that are about 2x faster out of the box.
A pair of WD Black 640GB $75 ea.
A 10K V-Raptor 150GB
SSD is the new king of the hill in performance for boot drives.
I wouldn't touch an 8MB cache 320GB drive. I have some 3 yr old 160GB WD RE series and they were nice at the time, but outdown by new Caviar. And cost me a lot.
If you want to experiment and try for yourself, there are some listed MacSales - WD HDD
People are very happy with the WD Caviar 640GB, and Apple uses that in the 2009.
WDC WD6401AALS-00L3B2 Benchmark
Transfer Rate Minimum : 59.1 MB/sec
Transfer Rate Maximum : 118.1 MB/sec
Transfer Rate Average : 96.4 MB/sec
Access Time : 11.8 ms
Burst Rate : 125.3 MB/sec

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