Both my previous sink and my new sink were Kohler Cast Iron sinks and I love them. Here is a video link on a Kohler Whitehaven Cast Iron sink that meets your qualifications:

Here is a link that might be useful: Kohler Whitehaven Cast Iron sink

Here's another thread on sinks that may be helpful:

Here is a link that might be useful: Kohler Whitehaven sink - yay or nay? other sink/facuets ?s

Thank you, Shayerah! I definitely love that Kohler Whitehaven sink! I appreciate your time in posting the links -- very helpful! Any suggestions as to where to look for the lowest available cost?

Both my previous sink and new sink are Kohler Hartland (before reno was white top mount and after reno is black under mount). White sinks seem to be MUCH cheaper than colored sinks but I got my black one from Home Depot. It was quite pricey ($806.22) but I signed up for a Home Depot credit card and got 10% off. Still expensive but you can't complain about $80 off, right?? I did quite a bit of searching and found that no matter the seller the Kohler Hartland sink was exactly the same price. You may find after doing extensive Google searching that the Kohler Whitehaven is in the same boat...no matter the seller it is the exact same price. Good luck!

Thanks once again, Shayerah -- I am finding that the price varies somewhat, from expensive to very expensive. But I will keep an eye out since I won't need one for a couple of months. I really appreciate your info.

I noticed the price difference was based on the size of the sink. So, when watching just make sure you're watching the correct size you need. It looks like it comes in 30", 33", and 36" as well as single bowl and double bowl and even a sort of "decorative" front. I've included a link to Kohler's website which shows all the options for the Whitehaven sink so you know exactly what you're looking for when monitoring prices.

Here is a link that might be useful: Kohler Whitehaven Kitchen Sinks

Kohler eliminated a bunch of sellers that sold too low and now only have a few Authorized Resellers. And they practice UMRP. You may find a lower price with a specific seller's promo, but it won't be advertised or on the net.