Hello,
Although I don't like buying cheap tools, one of these inexpensive Harbor Freight rotohammers is a good alternative:
A problem I found with the lower cost hammer drills is that the bits will slip. They hold ok for the first dozen or so holes, but then start to slip.
It's not bad if you only have a dozen or so holes to drill, but it get's a bit old after that.
Hitachi and DeWalt both offer a keyed chuck model for under $100. @ Lowes. In retrospect ( plus after ~ the 30th hole ) I was wishing I'd have gotten one.
Re: Drilling into the floor/walls.
Before doing that, and I apologize for not reading more carefully the initial post, make sure the walls and/or floors aren't pre-stressed concrete.
I'm not 100% sure why you aren't supposed to drill into it, but I've read a lot online that you're not supposed to.
"Life is what happens to you while you're busy making other plans." - John Lennon