Adding new hard drive to Mac Pro (quad core)

I've just ordered a new Mac Pro quad core (2.66 GHz) with one GB HD. Since Apple is charging £240 for a second drive I decided to get it from somewhere else. I found a 1GB Western Digital Caviar Green but I also noticed 1GB WD Caviar Black. I wonder if anybody has any experience of those drives and would they work with the latest Mac Pro ?
Does anybody knows what make of drive is Apple using in their latest Mac Pros ?
Tom

*WD Caviar Black 640GB*
HD Tune: 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
*Black Caviar 1TB:*
HD Tune: WDC WD1001FALS-00J7B Benchmark
Transfer Rate Minimum : 53.9 MB/sec
Transfer Rate Maximum : 108.7 MB/sec
Transfer Rate Average : 86.1 MB/sec
Access Time : 12.9 ms
Burst Rate : 111.5 MB/sec
+(note the slower average to the smaller 640GB model)+
*Green Power 1TB*
HD Tune: WDC WD10EADS-00L5B1 Benchmark
12-23-2008
Transfer Rate Minimum : 41.6 MB/sec
Transfer Rate Maximum : 95.6 MB/sec
Transfer Rate Average : 74.3 MB/sec
Access Time : 14.0 ms
Burst Rate : 117.2 MB/sec
*WD Caviar Blue 640GB*
HD Tune: WDC WD6400AAKS-00A7B Benchmark
Transfer Rate Minimum : 55.6 MB/sec
Transfer Rate Maximum : 113.3 MB/sec
Transfer Rate Average : 90.2 MB/sec
Access Time : 11.8 ms
Burst Rate : 112.9 MB/sec
the 32MB cache did not make a real or noticeable difference in benchmarks
http://www.barefeats.com/hard112.html

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