Do you want a plain old drill, or a drill-saw? What size holes and what material/thickness?
I've been very happy with my cordless DeWalt drill/driver - very powerful, long lasting battery recharges in 15 min.
I don't have a rotozip. I'd like to get one, but I've heard that it takes some practice to use properly.
I've read that Rotozip has been bought by Bosch Tool, and that they've come out with several new models. http://www.rotozip.com/
You may be able to get the older Rotozip models cheap, but I would check with Bosch that you can still buy parts.