I have a Sonata, and it is a very nice case. However, the PC connected to my TV is in an Antec Overture case. It is low profile, and there is plenty of room for the MyHD and DVI cards. However, it runs much hotter than the Sonata.
I think Antec has addressed the heat issue, since the picture of the Overture now has a big vent on the side, and the picture of the Overture II appears to have a vent on the top. My case has neither.