Adam, even though your Budapest math was wrong I wouldn't be discouraged - it would be a fun trip to make
I tell people I own an aircraft but I also usually tell them my type is not as expensive as they might think.
BTW I do use mine for business trips but always have a backup plan for public transport. I don't mind admitting that I was really pleased to win one contract partly because the client is very near a nice GA airfield and the trip by air actually does save time and money over car or train!