should i get another instant hot? (the prep sink will be closest to fridge/breakfast area). i think i just answered my own question. ...but what goes on at your prep sink? am i forgetting anything? do i need TWO disposals as well?

Two disposals, absolutely. If you are using your main sink for clean-up you'll need a disposal as you rinse or scrape your dishes, and your prep sink will need one for vegetabale peelings, etc.

I am putting a soap dispenser at each sink, but the one at the main sink will have dish soap and the one at the prep sink will have hand soap.

I don't have an instant hot, but I am wondering if I need a water purifier at each sink.

In this case, more is right and more is not regretting it later!

Keep in mind, I don't have a prep sink (our kitchen isn't large enough), but in the Kitchen-That-Was (meaning, pre-reno), there was no disposal and honestly, kateskouros, would you believe that was the one thing to which we both were the most looking forward? Just to having a disposal.

Your kitchen is going to be really, really pretty -- you are a thoughtful, detail-oriented person. I would imagine that it would bother you to have a tub of soap, no matter how decorative, out on the countertop around your prep sink. I also think the symmetry will be appreciated by you in the long run.

Additionally, the insta-hot and filtered faucets are just plain smart at any sink which could be used for drinks or food prep -- how often do you need warm water for yeast, let alone (hot) for making tea? Often enough to justify having it right there.

That's my twenty-two cents!

Two disposals, two soap dispensers, but only one instant hot.

well thank you all again. two of everything it is!
and rmkitchen, you are too kind. i just hope i can make the finished product live up to your expectations. now you're making me nervous!

we are just waiting on the final building permit and the drawings. i'm looking forward to a giant, muddy hole in our backyard! should be less than a month. fingers crossed, please!