unfortunately beggars can't be choosers. the H11DSi is really the only readily available board in NA. theres a Gigabyte board floating around (MZ72-HB0) but i havent seen it available outside of one seller in Europe.depending where (in which computer case) you put your mainbaord, be warned (ore carefull)with h11dsi-boards.
if you use 19" inch rack server case with good and correct airflow (and using air shroud), then you can go with supermicro boards. otherwise you will have heating problems with VRM's