From what a 1GbE NIC can do vs a 10GbE NIC the performance of a bond will only widen the pipe size. If you are using iSCSI with Microsoft you can use the MPIO option. Link below provides more information on this subject.
LACP and Cisco PAGP use an XOR on the source/destination of the mac or IP address to determine how traffic should be balanced. You generally will only get see the benefits when you have many traffic flows between many sources and destinations.
Okay, I have read that GlobalSAN shall also be able to do MPIO, although it is not mentioned as a feature in the manual, but I'll try.
If that doesn't work out, I will have to go hunting for some 10 GbE cards - fortuanetly there are a couple for OS X. As for Open-E, I guess that the Intel Pro/10GbE will be supported?