Read all you can, choose the watch you want, with me, it was a Sub.......I did my research, there are great reviews here. They taught me what to look for in a good rep as well as pointing me in the direction of the dealer that had what most closely met MY requirements. That's the key, buying a rep is just that a rep. You will not be able to buy a 100% rep, they all have imperfections of one type or another, and it is up to you to decide what most fits YOUR needs. Many here buy reps that are good foundations for modding, and some are close out of the box, for those who don't want to mod........do your research,for what you want, and then research which dealers,(use only recommended dealers),and make your purchase......
Good luck, the rep bug is about to bite you!