If you're in Sweden , you'll have a hard job operating one of these things from what I've been told.
Your best bet would probably be an L-39 on the Estonia register as its JAR EASA compliant, but check with your civil aviation people first.
The cheapest jet to operate in terms of fuel burn is the Mk3 Provost at around 600 litres an hour !
Still a lot of fun , once you've flown a jet you'll find it very difficult to climb back into a Cessna !