SCSI RAID card recommendation (1/2 height PCI-X U320 SCSI dual channel)

[Vivek Khera]

Boy... what a major disappointment I just had...

I got in my SunFire X4100 dual opteron server and a LSI MegaRAID  
320-2X PCI-X card.  Unfortunately, the Sun seems to only accept 1/2  
height cards.  Totally lame.

Anyhow, I'm having a hard time finding 1/2 height U320 RAID cards  
with dual channels (I can't imagine how the connectors would fit, but  
hey I can hope).  Does anyone have any recommendations?  Naturally  
I'm going to run 6.0-RELEASE on it.