advice on raid controller

Hi, i'm on the verge of buying a "MegaRAID SCSI 320-2" raid controller.
I need it to build a db server using 4x ultra320 scsi disks
i'm thinking raid 1+0 but will try with raid5 too and compare

Does anyone have any experience with this model, good or bad i'd like to
know.. thanks :)

as seen:
http://uk.azzurri.com/product/product.cgi?productId=188

Regards,
Richard.

PS: whoever mentioned starting a site with raid controller reviews, excellent
idea - its hard to find decent info on which card to buy.