Okay, this isn't really an ad, but I have done several kitchen remodels using IKEA cabinets, and tiling under the entire kitchen is definately the way to go with these, as they stand on their own legs.
The IKEA cabinets are less expensive, and in many cases as good or better quality than any other knock down cabinet I have seen, and even better quality than a lot of prebuilt cabinets for that matter.
You owe it to yourself to at least look at them. I really liked putting them together, everything is predrilled exactly dead on, and every part fits perfect. The hardest thing to learn was that if you couldn't find the part you thought you needed, you just haven't opened enough boxes yet.
Be patient with the order dept, but other than that, it's awesome!