About the XL,
Well two models to consider: the Excel and XLS. XLS has more power, nicer avionics, climbs faster and gets you a little bit more range (for ex.:Sofia-Madrid is no problem in an XLS but a problem in an Excel) First hour burn is 1800 lbs then it depends how high you go. (1050-1200 an hour) The Excel at MTOM goes up to 380-390 with ISA +5, The XLS goes up like the old Lears and doesn't stop until 430. Up there you fly slow (.70 for the first 30 minutes, then it accelerates to Mmo (0.75).
In my opinion the C56X is for Europe what the Lear 60 is for the US: Go mostly everywhere from mostly anywhere. The airplane operates in and out of LCY, goes to Samedan, Lugano, Innsbruck and Altenrhein. Moscow Winters are not really a problem once you take the battery with you. (easy to disconnect). It is basically maintenance free and it is easy to fly.
Be sure to get one with an APU. Passengers (seats from 6 to 10) like it and gives you independency. It has an almost standup cabin (1,75m i think) and they will have the privacy of an enclosed lavatory. There is no room for luggage in the cabin, everything needs to go into the gigantic 700lbs limit baggage compartment located between the engines. It is easy to access with three steps and it covers you on rainy days.
Hope this helps.
LearjetGA