I'd like to know as well as to how you keep the LSI card cool (and 10gbe nic) with that little air flow! It's a beast back there in those slots!
I also found the 8 port versions far more stable since there is no SAS expander chip - you can literally buy the front clip from folks off ebay and slip them on. The P4300 G2's I'm running are configured that way and are far more friendly when drives go kaput!
I'm running esxi 5.1 on all of mine so perhaps that has something to do with stability but i've found that when I lost a SAS drive (1-6 are sata 2tb, 7-12 are 300gb 15K SAS) - i'd also lose a SATA drive when inserting a replacement drive. Nothing like this happens on the models which are direct connect *8 ports* no sas-expander. So i've gotta wonder what that little sas expander has to do with this ?
Also under ESXi with the sas-expander it sees two paths to each drives, without the sas-expander (8 port) it only sees 1 path to each drive!)