Upgrading from 400GB to 750GB Drives

We're looking at upgrading our RAID to use all 750GB drives. Right now we have 3 separate RAIDs in the same Xserve RAID with 750s, 400s, and 250s. The 400s and 750s are LUNs in an Xsan and the 250s are a separate local hard drive storage.
What would be the best way to get rid of the 250s and 400s and migrate them all to 750s?

Well I guess my question was more pointed not so much at hardware purchasing but at how can I expand my 750GB LUN while reducing the size of my 400GB LUN. I can't really copy the data off of the 400GB LUN directly since it's part of an Xsan and data could be split amongst it and the 750.
Basically I want to go from this:
<pre>
( === RAID 5 ==== )( ====== RAID 5 ====== )
| 400 | 400 | 400 | 750 | 750 | 750 | 750 |</pre>
to this:
<pre>
( =============== RAID 5 ================ )
| 750 | 750 | 750 | 750 | 750 | 750 | 750 |
</pre>

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