Re: pressurized water system
I've got a small SurFlow pump. It's got enough power to run one or two fixtures at a time, just don't go flushing the toilet while you're washing up and your wife is taking a shower. Yell out your intention, flush, stop, wash, stop. It's really no different than being hooked up to water with a cheapo pressure regulator.
You don't want to conserve too much water while taking a shower. Shutting water on and off is fine, but if you don't have enough water flowing the pump will cycle on and off. You'll have a very annoying constant pressure change. Just turn up the water a tiny bit, the pump will finally stay on continuously, and you'll have an enjoyable shower. It'd be nice to have a separate tank to even out any pressure changes, but for the added cost, complexity, and room it'd take up, just not worth it (to us).
Oh, and our fridge also has an ice maker, but due to it being on the opposite side of our plumbing, it's not hooked up. I don't think we've filled up any of the two ice trays we have since we were in Houston, and we left there the first of June (just before the big heat wave).