What is a fair asking price for my car?

I own a 2004 Honda Accord EX-L 4 cyl and it has 220,100 miles, it runs like it doesn't even have that kind of mileage on it. I want to trade it in for an 07 Accord EX-L V6 with Navi and its a standard transmission with 71k miles. How much should i ask for MY car and how much should the other car be priced at? I don't want them to finance me for more than what the car is worth, i just want to pay the difference

Look up their book values at KBB,

You can get an offer for your car at CarMax. Then try to sell it on your own for $1000-1500 more.

For a car with that many miles, no dealer is going to give you anything for it as a trade-in -- because he doesn't want it for his used car lot -- because very few customers want a car with 220K miles. Doesn't matter how good it runs. You would be better to try to sell it yourself and use the money as a down payment on the new car.