I suggest the Skogg System DVD. When I bought it it was full priced at $79.95 and it's now on sale for $39.95. I've gotten several people into this DVD at work and even a couple of people at my old CF box and they all love it for home workout in minimal space and time.
2 years ago when I first started to workout and lose wieght, along with Krav Maga 3 nights a week, I lost the first 50lbs of my total 80lbs lost that year following this system for the first 6 months.
I started doing kettlebell work specifically because of my lower back and shoulder problems that I've been dealing with for years.