KISS machines in various conditions START at around US$2200 but seldom sell for less than US$2800 for average machines. The US economy may have dropped the value of ALL pinballs over the last two years, but irrespective of what title you want to import, add AUS$2000 to your door (depending on where it is located).
KISS, Playboy, Fathom, Viking, Paragon and Medusa all command higher prices than the lesser titles. I get asked for restored KISS machines at least once a month, then Playboy, then Fathom. Playboy has dropped its value slightly, but it will double in around 5 years.
There was a 3 month period where no less than 4 Paragon's were on eBay (Wottos, one from Tasmania and two from the SE suburbs. One was strictly a project). I have not seen a decent Paragon for sale in a while.
Viking and Medusa - Never seen them on eBay. Collectors won't part with these titles. These two titles will appreciate over time.