Join Date: Mar 2002
Location: Southern Rhode Island
Definitely do the water pump, hell it's off anyway, it'll cost more than $100 to do it later. (This is assuming of course, that you are having the work done, not doing it yourself, as it seems.)
The oil pump, I would personally do if your oil pressure hasn't been up to snuff. However, how does the oil pump mount on the 2.5s, is it inside the pan, therefore altogether separate from the timing chain change? If so, don't bother having it done, it won't save any money on labor. I am assuming this is the case, or else it wouldn't cost 300! Oil pumps are cheap, it is all labor.