Is this the page you're looking t?
http://www.nuceng.ca/bill/volvo/database/ecu.htm
To answer your questions -
Yes, a lot of pink-label ECUs are known to fail. For why, see link below.
http://turbobricks.com/forums/showpost.php?p=5636177&postcount=33
You'll be looking for a B230F ECU, not a turbo ECU. Forget about turbo ECUs. The only things you need to worry about are if you have a cold start injector (or not); and if you have an EGR car (or not). A -951 ECU is your best bet.
You may have better luck sourcing an ECU locally via the wanted section of Turbobricks - it's where I go shopping for parts I can't find in OZ - and IIRC there's quite a few guys in TN on that site.