The new Sun Primary Storage 6580 and 6780 were announced recently. One of the key features which I like the most is the performance enhancement compared to the ST6540 array. The ST6780 features almost double the performance capability as compared to that of the ST6540. Scalability is another excellent enhancement.
Check this out:
http://www.sun.com/storage/disk_systems/midrange/6780/
http://www.sun.com/storage/disk_systems/midrange/6580/