Hundreds of dollars extra is something like this. Total = n * $100 where n is any integer over 1. You mentioned $600, which is a very low estimate that will also grow over time after upgrading your parts -- keep in mind a person's console will have stayed the same over these course of events. Okay so we have the $600.... the xbox360 is $300.... 600-300 = $300. This falls in line with that equation I talked about. The n would be 3, which would qualify as being hundreds of dollars extra.
You just got Kupenned.