You really don't need a quad-band phone. All that is used in Europe is 900 & 1800. You can get by with either 1800 or 900 depending on the carrier you plan to use. The traditional tri-band GSM (900/1800/1900) phone will give you everything you need. Right now TigerDirect.com has a Moto v188 quad-band GSM phone for $50.
Click here to see phone.