As Toast said -- depends on what you want to use it for.

Some red flags
Out of Annual
Craigslist
5K OBO
Don't know much about that engine - are parts readily available?

About what to ask:
Do they have the full logbooks? All ADs complied with?
Any Damage history? NTSB Aviation Database Query Page
Clean title?
Are the radios compliant (the 25/8khz spacing thingy)?