apples to oranges- they should not be in the same comparison-the prices you differences are close to what you should expect (even though all are pocket hole constucted frames etc). If WBF best suits your budget then fine. But if you can even consider affording DS then ... Sounds to me like one of the dealers misread where your at. DS comes in two price groups, and offers both framed and frameless as well as inset. Even the lower priced DS will be a good bit more than WBF DS vs. Kraftmaid- DS has a very nice finish and will have better wood grading, quality control, along with more design flexibility. KM makes a competant cabinet that will last and has a good selection. You may need to have a door or two replaced to get where you want to be, they might be a tad trickier to install. But bottom line they will hold up for a long time- lots of GWbers have em and are happy- that might be said for the others too though. I'm not a fan of Chinese cabinets so not big on JSI- there is a thread on that where you will find some more positive thoughts by others (along with my personal rant) There is another thread on cabinet priorities worth a look too.

With 42'' wall cabinets, the pantry size you need will be 96'', not 90''. 90'' aligns with 36'' uppers. You don't get what you don't pay for. No way on the imports if you want to actually live in the house. Not crazy about Welborn either. Move up to a real midgrade US made line. Shiloh, Kraftmaid, Kemper, Medallion.

Ultracraft was on my list initially because they had a good selection of slab doors in modern/contemporary finishes but I found a kitchen designer I liked who sold other lines and never actually visited an Ultracraft showroom. I do agree slab doors and drawers look better on frameless cabinets. Another brand to look at for modern slab doors is Bellmont (sold as Latitude at Lowes). Many negative reviews about cabinet companies are actually about the kitchen designer or installer so make sure you filter those out. Sorry can't help with Kemper.

If you can't get color data info from Kemper, your best bet is to take a door or drawer front to a good paint store. Make a decision about what product and sheen you want to use first, Because it's not going to be a product for walls in this case. Then go to a pro store, for example an independent Benjamin Moore store vs. a big box. They can measure the color directly from your sample and figure out the best solution.