OT question for the suspension gurus

Aparently I've "blown out" (in the words of the mechanic) the rear shocks in
my Legacy wagon. Now, I'm not doubting this, as I've known for a while that
the handling was shot, but he recomended against doing the front also. He
said as long as they aren't leaking they'll be fine. Everyone I've talked to
says the same thing, but noone that I've asked sees any value in looking at
it from a performance standpoint. I'm pretty sure the shocks are all stock,
on a car with 130,000 miles. Might I be better off replacing all of them
instead of just the rears?
--
Tonyrama
Crystal White '93 A
'95 Outback