Train from Rome to Paris to London

Good day everyone.

I would like and very much appreciate advice on where to purchase Train tickets from Rome with an overnight stop in Paris then off to London. This trip will be occuring first week of August 2009.

I%26#39;ve googled and have only found http://www.raileurope.com as the place to purchase multicity train tickets. RailEurope has quoted $676 for the Rome-Paris-London Trip. Is this accurate and a good buy?

We understand flying is the more conventional way to travel, but we would like to experience traveling by train.

All advice and suggestions are welcomed. Thanks in advance.

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google : trenitalia.it you can buy you ticket from rome to paris (or maybe to london), then on voyages sncf, buy the second part from paris to london