We have enjoyed Math-U-See for our math, mostly because of my middle son, who is LD. My oldest seems to do pretty well with just about anything, and he's used MUS Algebra I and understood it well. Next year he has Geometry, and then Algebra II. I personally wouldn't combine them..
For Literature, we like the Smarr Publishers Literature classes. They are heavy on composition and writing, but they assume a lot of pre-existing ability in writing. For the basics, we like Institute for Excellence in Writing.