Sometimes I find Chris Isaak to be a funny, pretty cool guy, but I don't think I'd watch his show. Looking at the rest of the Showtime lineup, there doesn't seem to be much there. I don't watch Sopranos, but I would love to watch Real Time and Six Feet Under. I saw an episode of Real Time while I was home, and would regularly watch it if I could.

Showtime lineup:
Queer As Folk
Soul Food
Odyssey 5
Jeremiah
Street Time
The Chris Isaak Show
Penn&Teller: Bullshit!
Family Business

HBO lineup:
The Sopranos
Six Feet Under
The Wire
Sex and the City
Real Time with Bill Maher
Da Ali G Show
Oz
Curb Your Enthusiasm
Def Poetry
Project Greenlight
Band of Brothers
Arli$$
The Mind of the Married Man