Those are good hours on the plane (TT & SMOH). That's worth something. We bought a 67G that had just come out of a $4,000 annual. Buyer paid for all of it. In the first year of ownership, we put $6,000 into it fixing things that we discovered and adding things to make it our own. Total invested to date (excluding its current annual, which is happening now). We've invested $25k in the plane. She's just about where we want her for now, and purring like a cat.
Expect expenses the first year. An IFR Certified plane with good mechanicals, decent interior, paint & clear glass sounds reasonably priced at 21k.
My advice is worth exactly what you paid for it.