Timing belt Options

[Niskyspy]

As of now my car has 94,000mi and I found out that the first owner never changed the damn timing belt (I asked him). Well now I think that I need to change the timing belt cuz he was supose to do it at 60,000mi. So I called up toyota and they gave a price quote on timing belt and water pump around 460$. But now there is a cupon which I can use to get them to change the timing belt (without changing water pump) for 286$. I think its a pretty good deal. But my question is, should I replace the water pump now. I have 1.8 liter engine and I think that the water pump is not driven by the timing belt and that its diven by (generator/ac pump) belts. So I was thinking just to change timing belt at toyota dealer and if my water pump fails do the water pump myself cuz its not too much work. So please give me some feed back on this.
Thanks

[Niskyspy]

another thing, how do the water pump break. I mean how will I know that its done (I am guessing the temp gauge will go up) but are there any other signs. For now I just dont feel like giving toyota 480$ for the timing-water pump change and I dont feel like spending a day changing water pump (cuz I'll need to take off them belts) and drain coolans/put coolant back in. I would do it if I had a garage but the problem is that I dont have one and all the **** that I do is done in the parking lot of my appartment.

Right now my plan is to change the ac/steering pump/alternator belts and change the valve cover gasket and bring the car to toyota. And since they will be changing the timing belt they will have to take all the the belts off and they will put them back on the right way (probably better than me). And then in the future if the water pump brakes I will just go to toyota or any other shop and ask them to change it, it should be easy cuz they wont have to take the timing belt off.