Wow, it's brisk out there today!
I thought this was Florida!
Jillian, since I am very seriously considering pulling dd2 and homeschooling, I've done a lot of research on this. What kind of things are important to you with curriculum and what kind of learner is your ds? Math programs especially differ widely in their approach. I know IVMS uses the Singapore series in the older grades (my dd1 in 4th is using it) and it's a widely popular program for homeschoolers too. I don't love it for other reasons (I think my kids need more review and less abstract conceptual thinking at the earlier stages) and am looking into either Horizons or Saxon.
For English/phonics, it also depends on where your ds is holding with his reading skills, etc. and whether you want a phonics based program or not. I lean heavily toward the classical approach in general because I'm a literary type person and a historian/political scientist by profession. I like the Well Trained Mind recommendations for language arts (check out their homeschool forums also, there's a wealth of great info there).
I also like the Sonlight curricula a lot, at least as a jumping-off point (everything is taught through the lense of history and literature, based on read-alouds etc.) and you can find most of the materials in libraries if you don't want to buy the program. www.sonlight.com
I know there are other homeschooling moms here who will be more helpful!