It's called SLK3700 BQE.
I have the Sonata, but if I were buying today I think I would buy this one instead, and then put a (Fortron perhaps?) PSU with a 120mm fan into it and sell the Smartpower.
Link to the frontpage at SilentPC Review, where I spotted it.
Link to the Antec 3700 page.
Edit: It's actually old news, but seeing as I have not seen any mentioning of it in here, I hope you don't yell repost.
I have the Sonata, but if I were buying today I think I would buy this one instead, and then put a (Fortron perhaps?) PSU with a 120mm fan into it and sell the Smartpower.
Link to the frontpage at SilentPC Review, where I spotted it.
Link to the Antec 3700 page.
Edit: It's actually old news, but seeing as I have not seen any mentioning of it in here, I hope you don't yell repost.