totally understand that feeling my friend, after recently buying the canon 5dMk2, 70-200Mk2, 100mm macro and the 24-70 all in one go! i kept talking to myself saying, "what the hell are you doing, how can you spend that much on talking a photo" lol. My wife was more like, go for it.
Anyway 3 months on and the pain is over but the pleasure still remainds. Just got to be careful to only spend what you can afford, and dont get sucked into the "i must have it" habit.
Selling images funds my habit, so that was my only justification.