Ummm... I don't even want to think about it.
PS3 Slim - $300
360 Slim - $300
Lots of games - At least another $400
Accessories - At least another $300 (I bought an Astro A40 headset)
I do sell most of my games after I beat them, though, so most of the expense in games is rolled over and I only lose $20-25 that way instead of $60.