It's difficult to know how involved a rebuild will be until you tear it down. Well maintained examples can go for 400k. Sometimes the motor goes at 200k, or 300k - there are plenty of variables, including use of the car, maintenance et al.
1998 328i "M-tech"
2001 TDI Golf. 1300km/tank commuter. Boring, slow, cheap.
1991 P-car: 964c4 Let the porcupine jokes commence.
Gone: '99 M3 vert, '98 M3 sedan, '91 E30, '89 E30, '87 E30, '91 Euro M5, '93 6-speed Corvette, STI v8 swapped '98 Impreza, '73 2002, 2004 325iT