Try putting your itinerary in www.railsaver.com (or click on “bookings” at the top of the page for another link to railsaver) for a recommendation. Follow the “I have a good idea of my itinerary” route and check “I prefer purchasing railpasses (to point to point tickets) ‘only if it saves money.’”

For Barcelona to London, I’d suggest that you fly. EasyJet, or another airline, would be good. Check www.whichbudget.com .

For London to Paris, check www.eurostar.com to see the price of a ticket. They’re usually much cheaper purchased in advance, and most railpasses don’t cover the full cost.

For Paris to Berlin, see if you can get a 39-Euro ticket on www.bahn.de or possibly two 39-Euro tickets (one to Cologne and one from Cologne to Berlin, for example). Or you could fly – this is easy on EasyJet.

Berlin to Prague – probably cheapest to buy in Europe, although I don’t know the price of this ticket.

I’d suggest a flight for Prague to Milan (or somewhere in Italy), as above. As an aside, I’d recommend Venice or Florence, or some other place in Italy, over Milan, unless you have money for designer shopping.

Milan to Rome – point to point by train ticket. You can buy ahead at www.trenitalia.com for a small discount, or just buy this in Italy.

For Marseilles > Toulouse > Ibiza > Barcelona, I really can’t advise. But I’d consider setting this up so you could fly to Ibiza, because that’s a long trip by other means I believe (I haven’t done it). For French tickets, check www.voyages-sncf.com . Keep your country as France, and post back if you have problems using the site.

In short, I doubt that you will get a rail pass that is efficient and cost effective for your itinerary, except possible for that last France/Spain segment.