How can I effectively compare data plans available in a country?

I'm going to spend 5½ months in Netherlands, and need to be able to make calls to Italy without spending a fortune.

After some hunting on Wikipedia I found that there are only three non-virtual operators in the country; I've since then started crawling the respective websites for information. Obviously, the operators all want to fish me for a 2-year subscription plan with smart phones and whatnot, while I "only" need a SIM card.

When those pages do give information about tariffs, they don't usually tell the full story either, and e.g. if I were to get tricked into getting a KPN sim card, I'd be paying €0.35/minute per national calls. You have to dig deeper to find out the plans costs €2.5/MB for data, and €1.16/minute for calls to Italy. Whoa.

On the other hand there are too-good-to-be-true offers like this one from T-Mobile, promising €0.24 (fixed cost for 30 minutes... per call? cumulative? who knows!) domestic calls plus €0.19 + €0.09/minute calls to Italy which has to have a horrible catch hidden somewhere in the small print of the Dutch-only contract.

Is there a resource that does compare mobile plans more clearly? I personally need it for the Netherlands, but if you can find a service/website/service that covers more countries, all the better! Bonus points for a site in English, but if the site makes sense through Google Translate I won't mind too much.