HI CBG
You'll have a great time flying through Romania,
Though:
AVgas is expensive
And, be very careful, I don't know if the situation has changed in the last few years.
In 2007 when we went there, with the AeroGP circus, we had to request authorization and took time and money to get it.
Flights, at least VFR that was our case, need a special clearance to enter Romanian territory from abroad, regardless if they cross from another EEC state or not.
You need a special code to report in flight plan upon entry. Failing that you were not allowed inside.
Be sure to check that out, in case its still in force, inquire how to go about, I don't know the procedure since it was done in the London offices at the time
Worth overfly the Carpatian mountains..Don't miss that !!