...I'll just remind you to *at least* double all the above costs from US guys
No way you'll get a clean working 986 for $6.8k US / $8.5k AU that badboybox paid above for example, the cheapest on carsales at the moment is $12.5kAU, and if you buy the cheapest car in the country, you WILL have to fix stuff!!
My first big expense, a year or so after getting mine, was new clutch, RMS, IMS and rear control arms... $6K... oh yeah and $1k on tyres... it adds up.
Oh yeah... and don't forget to check insurance also... most of the big names won't even ensure me (44, no demerits, no accidents ever) or want silly money... cheapest I found was Real Ins. at about $800pa but the most they will insure it for is $3k less than I paid for it