When you are searching for a designer, search for one that is local to the area where you want your home built. Typically, local designers will have a better knowledge of the region, the laws, and the other issues surrounding your new house building project.
Modern home plans come in all shapes, sizes and styles. It will be up to you to find the one that best suits your needs. If that's a contemporary plan that includes an open layout, you can find plenty of great plans available to choose from. Of course, you also have the option of creating your own home plans based on your requirements, be they extra bathrooms for the teens, home office or workout space. Perhaps you want an open kitchen and lounge area, but a private dining room. Maybe you prefer the entire lower level to be open but want the sleeping areas divided accordingly. It really doesn't matter because you can get whatever you want.
Exposed wooden or steel beams, flat roofs with large overhangs, and split levels to take advantage of the terrain, are also common accents associated with the contemporary style.
It is wise to speak to your architect about potential roadblocks in the project and about any other extras that are likely to be added to your bottom line figure. You may also want to discuss anything that your architect may think is a better design choice.