You should find out where the oil is leaking -- probably the rear
valve cover gasket. It's a known problem with the V6. 50K miles and
these rubbers start to weaken sounds about right. It may also be the
PCV valve plugging up, forcing oil out of pan gasket, etc lots of
possibilities here. So check to see WHERE the oil is leaking from.

The timing belt will begin to stretch at 50K too, but the auto
tensioner will take up the slacks and won't let it whip the timing
cover like in the 3/5SFE engines. If you have 7 years on the car is
about time (time-wise, not mileage-wise).

I'd also replace parts like the following (older prices from www.rockauto.com)
GATES TCK257 timing component kit $89.79
FEL-PRO TCS45890 crank seal $6.27
FEL-PRO TCS45889 cam seal set $8.55
GATES K060410 Alt/AC belt $13.09
GATES K040345 PS belt $8.61
ASCO/AISIN Part # 1610029085 water pump $61.79 (I like to use Airtex
pumps
from the local NAPA store)
Total ~$188 + shipping

If needed: FEL-PRO VS50471R valve cover set (with spark plug tube
seals) $30.79