What spinnerlys said, can't give any advice without knowing what you want from it.
If you want better low light, a DSLR always trumps Powershots (and most other pocketable cameras), but if you want a huge zoom, you're better off with a Powershot since an equivalent focal range for a DSLR would set you back about as much as the camera-body itself.
These "what thing should I buy?" threads are difficult enough without the OP forgetting to mention how much he's willing to spend. (i.e. You're not going to get a ton of mileage out of 300 euros, if you're looking to buy a DSLR.)
Once you have that down, you can tell us (2) what you don't like about your current camera, and (3) why you think an SLR will be a better choice.