Buy the bike and ride the wheels it comes with. When/if it fails, it will probably just be a broken spoke. You can usually limp home with a broken spoke and get the LBS to replace the spoke. After you break 2 or 3, order a handbuilt rear wheel with 36 spokes. I've done this a number of times, until I wised up and ordered a handbuilt wheel.
I rode 3,000 miles last year weighing 270-290 and didn't break a spoke on a handbuilt ultegra/open pro combo.
Bob