I think that would look great. I had Simply White trim in my last house and painted my cabinets the same. I did use different sheens though. Semi gloss for trim, satin for cabinets.

I would stick with the alabaster. All of our trim and kitchen cabinets are painted SW Pure White. Definitely looks more cohesive than if I would have changed up the color. The only thing that I would caution is to find out exactly what they plan to use to finish the cabinets. Factory finished cabinets use post catalyzed conversion varnish. Make sure that they prep the cabinets appropriately and use the correct products for a durable finish.

I just painted my faded-red kitchen the SAME color white as my trim/baseboards. Trim is gloss and the cabinets are satin. It's been done for 6 months now and still love it. Although I'm growing to hate the wall color more and more each day. Another dilemma. But even with my window trim next to the cabinets I like it!