The 04 and 06 are virtually the same car. Therefore all things being equal, buy the cheaper car. I would buy the less expensive car, drive it for a while and use the extra money to make repairs or upgrades. The only real difference is the price and how the previous owners treated them.

I always asume a used car salesmen is a used car salesmen, therefore asume you will never know any car until you own it and have an oppertunity to drive it for a while.