best (midrange) disk array for the buck for e4500

I am currently looking for a disk array to replace one of my a5200 in 2 x e4500+3 x a5200 setup (+fibre hubs, clustered). I need to give up an a5200 due to an end of lease.

The a5200 are fully loaded w/ 9gig disks--w/ an OLTP database on top.

I like a5200's, but I don't like the fact that they don't use 15k disks, and I'd like a disk array w/ 18gig drives that can handle the load.

Thanx for your suggestions.
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We use Oracle 8.1.6-8.1.7 on Solaris 2.6, 2.7 boxes

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