Low Dollar = Dump gravel on top of the grass. Spray roundup later.
If you start with a larger rock like road base and gradually over the years add smaller rock as the bigger stuff gets packed down, you'll end up with a good packed driveway. In the mean time your rocks may be a little loose to begin with, but you won't have the mud.
For 80 feet, I'd start with a single load, which should be about 25 to 27 tons of road base gravel. That will give you a good, solid four plus inches of rock.
What you want to do is send the water off to the sides and away from your road as fast as possible. Digging out the top soil is only needed if you have a layer of organic material that you want to remove. Such as top soil. If it's sand or clay, then there is no reason to remove it.
When road base is 4 inches thick, or thicker, it will lock together when compacted and becomes a VERY GOOD road. It will hold water and it will shed water. It's up to you to get the water away from the road and not let it get under the rock. If it does, it will wash out under the rock and you will wear thinn real fast.
NEVER drag a box blade over a compacted gravel road. All you do is break up the rock, make it thinner and ensure a faster failure rate.
How much rock you buy depends on how high you need to build up your drive to get it to crown and send off the water.
If you buy any sort of paver, you still have to give it a solid base underneith. Lots of places pour concrete under pavers to give it a solid base. You don't do pavers to save money, you do them because you like the look enough to spend extra money to have them.
Good luck,
Eddie