I undermounted a Whitehaus fireclay sink because I wanted a fireclay sink, didn't want the apron front, and liked the sizes available in the Whitehaus product line. (None of the true undermount fireclay sinks quite fit my size requirements). I have a wall mount faucet, so didn't need space for a deck mounted faucet behind the sink--so the deeper (front to back) aspect of an apron front sink worked well for me to maximize the size of sink I could fit in my small kitchen. If you plan on a deck mounted faucet, though, you'll probably need to have countertops deeper than 24" to allow space for the faucet--check the sink measurements. Installing the sink didn't seem to be a big deal for the installers--they just added a support structure inside the sink cabinet and set it in. The countertop (Paperstone) installers templated for the sink, and added some shims to make the sink fit snug against the countertops. No problems so far, and I don't regret not going with the apron front. In my small kitchen, I think the continuous run of cabinets/countertops looks a BIT more expansive than it would have looked with an apron front sink. While there are lots of nice examples of apron front sinks in modern kitchens, I think I agree with you that a regular undermount sink will have cleaner lines in a modern kitchen. If you aren't terribly attached to the Shaw's sinks, you might want to look at Whitehaus or other brands (like Franke). You really pay a premium for the gorgeous curves on the Shaw's apron-- but if they won't be visible, might be able to get a better deal on a different model. (I got a great price on my Whitehaus 501 model online from Home and Stone) Here are a couple of pictures... hope this helps! (oh---and ignore my index card backsplash!)

I have the fireclay clean up sink on the perimeter and the stainless undermount in the island for the prep sink. They are close enough I can turn and reach the other sink. The KD suggested the stainless. I considered other materials, but I liked the size of this one the best. The stainless sink is not a shiny finish. And the appliances are stainless, so it's not the only stainless in the kitchen.

Unfortunately, a Shaw's isn't in our budget for our new kitchen (in our new house) to be built next year. But we do have an Ikea not too far away, so the main clean-up sink is the Domsjo double-bowl apron-front sink, and the prep sink on the island will be the Domsjo single-bowl apron-front sink. Not a very helpful answer, I'm afraid! And yes, I do prefer a double-bowl sink for my washing up : ). I was so nervous (or paranoid, I suppose) that Ikea would discontinue the sinks (which I've heard can be hard to find anyway in some cities), that we bought them last month, even though we aren't starting construction until next spring... But I don't think they need to be matching, unless that's what you like. I have wanted a Belfast sink for the past 25 years, since graduating from university, so nothing besides budget was going to change my mind! Here is a link that might be useful: Domsjo's single-bowl apron-front sink

I have a slight positive reveal on my sink and I really like it. I looked at displays with all three and decided I liked this the best. I did not want to lose any of the sink area with counter overhang and wanted the sides of the sink to show. I have clear caulking and it doesn't show at all. The sink is very easy to keep clean, I use Bar Keepers Friend, and the sink edges just don't get dirty. Once the kitchen is done and you are working in it, you won't notice these little items at all. Enjoy your new kitchen.