IMHO...
Yeah, with a 185k I'd replace the water pump. You are already in there, so go ahead and do it now. You'll need water pump, gasket, and new thermostat. To remove the thermostat, you'll need some heavy duty retaining pin pliers, with the straight, or slightly bent tips. (90 deg tips won't work.)
Everything SoCal said.
If you do replace the Balance Shaft Seals, be careful, the upper and lower seals are unique, don't mix them up.
Good Luck
JM