Questions about HD & shooting for HD/SD

[Kaido]

I'm starting a new project where I'll be making video tutorials. I'd like to shoot in 720p widescreen but also have a SD 4:3 video available as well. I have access to both Macs and PCs. I did video years and years ago on Hi8 with SD, so I'm familiar with the basics of videography but not so much the new stuff. What's a good camcorder? Do any come with a visual guide for lining up 4:3 shots, maybe a guide box?