I agree with the Sauce, you shouldn't have any trouble operating a DSLR. It's only as complex as you want it to be... it can do auto-everything like like a point-and-shoot, but as you learn what you're doing, you can start doing things manually to achieve certain results.
Cameras like the S5 IS are marketed as being intermediate cameras, and aside from the impressive zoom ranges, the ability to use manual exposure modes, and a few bells and whistles, image quality isn't much better than other compacts because they use the same tiny sensors. They produce a lot of noise in low light conditions as a result. Still, the S5 is a good camera at a decent price, and playing around with it for a few months can help you figure out where you want to go next. I used a Canon G7 for a while until I realized I needed a DSLR to create the kind of images I wanted.