pixels.ie
If you're in Dublin, you could try pixels.ie. They have a few shops, I found the staff in liffey st. knowledgable and helpful. Most of the magazines in news agents have a "what you need to know" guide also. (bought a camera from them, other than that, no affiliations).
Some things to think about:
- main elements are resolution (megapixel), zoom (optical & digital), memory, batteries (standard, charger pack etc.).
- not sure that buying off the internet is any great saving, sometimes the spec can be different (e.g. docking cradle not supplied), plus there is postage and taxes.
HTH.