Gents, if you are worried about what your wife will say if you bring home another pair of running shoes, I suggest you take a page from the female play book. Hide them in the trunk of the car until the coast is clear. Run in them a few times to rough em up. Then, put them with the rest of your shoes. When the wife asks/accuses "Oh, I see you bought some new shoes?!", you say "Naw, I've had those for a while."
Ladies? No advice for you...you already know that trick. Go get yourself a pair! He will never know!
4 Shoes on the 4 Shoe Scale!