How many miles do you have in the car? I'm pushing 60k and was thinking of getting it done to be preventive also. I would like to wait because of the cost but I hear some go out at 60k and some last to 120k. Something that varied I just need to get done I don't strand my wife and kids.
I've read a DIY on replacing it, it is a little tricky to access and remove. You have to remove the stabilizer bar or at least one side of it. It might be worth the $300 in labor to save me 4 hrs or more of jacking with it. It's right next to the thermostat so if I were you I would replace that again unless it's been a few thousand miles but if your gonna sell might not be worth it.