When I bought my house I knew I had a lot of work to do, and found a decent deal on a ryobi kit at Home Depot, about $250 if IIRC. I would have liked to get the Milwaukee kit based on friends recommendation, but at $400 I couldn't justify the added expense over the ryobi. The kit Came with the drill, Circular saw, sawzall, and a worklight. I sprung for the Lithium upgrade and sure am glad I did. Can't remember if I bought one seperate, but I have two batteries - a small and a large one.
The sawzall does indeed eat the batteries quickly. But, between the two batteries I was able to work pretty steadily - READ: not constant use. The batteries charge fairly quickly, so I would say with 3 full size batteries you could cut continuously in a cycle. However, for full time day in day out continuous use, I would recommend a wired sawzall. Some day when I got some spare cash I will start watching for a CL deal on one to add to my toolkit. Personally, I like the portability of batteries, and don't need full time cutting, so this kit worked for what I needed.
I later bought a ryobi angle grinder. That thing is a BATTERY HOG! The job I bought it for meant a few hours of grinding and was here at the house, so I went back the next day and bought a wired one too. Didn't even think about taking battery powered one back - never know when I might need it on a job away from power.
So basicially, I can recommend the Ryobi line - I felt like I put all the tools through their paces, and still work just the same today. Love the light weight compared to my old DeWalt drill, and the internal level on the drill is great too!