http://www.asrock.com/mb/amd/990fx%20extreme3/ it says that supports 8 core processors (125w processors and the FX8300 piliedriver, also it says that i support some 140W TDP processors) and i would go for asrock instead of biostar, i dont know... personally Asrock have served me very well for long enough to recomend their products over most other companies.
You 8350 is just an overclocked 8300, while it runs about it's 125w TDP, everything is fine.
STILL, the biostar mobo looks solid. What's your color preference or brand preference then?