Most homes have the space for a 24" dishwasher. Dishwashers come in 18" , a shorter below-counter model, or a countertop model, but they are quite rare in the US. The most standard color front panel these days is still stainless steel. Stainless looks nice and can blend nicely with other stainless appliances, regardless if your dishwasher is a different brand than your other appliances. Another common door is fingerprint-resistant stainless. It can be a slightly different sheen than traditional stainless, but is much easier to keep clean.