I'm not a Ruger hater, really. I have a Super Blackhawk, a MK2, and a 10/22.
I had a P-89. I bought it the day I turned 21, in 1998. It was grossly unreliable, rust prone, and generally a clunky POS. The safety, which worked as a trigger disconnect, hammer disconnect, and hammer block... Became so worn that only the hammer block worked. I sold it for $150.
Ruger makes great rimfires, and rugged revolvers (albeit not-elegant). Ruger center fire pistols are IMO not worthy of anything more than hobby shooting.
Get the GP100 or other revolver from Ruger. Then get a real defensive auto, like a Glock/XD/M&P/Sig, if you still want a defensive autopistol.