A tractor with a box blade would be your best option. I would look around and find someone with experience to do the work for you. They will probably do a better job in less time and cost about the same as renting the equipment and doing it yourself.

An experienced finish grader with a box blade on a real tractor (not a Bobcat) can do 2 acres in a morning as long as there aren't any trees or patios in the way. After that it is immediately ready to plant.

Where do you live? We can help you not make some mistakes. With that in mind, 2 acres is a LOT of lawn. Can you irrigate that much? In the hottest heat of summer you'll need to water 1 inch once a week. I have a long list of alternative elements you could add to the landscape instead of lawns if you are interested.

I'm in Ohio. Would like to here other options... fire away!

alternatives to grass on large acreage

accent lighting in trees
arbors (for vines)
bamboo
beds (perennials, annuals, bulbs, herbs, ferns, roses, hostas, container plants, rock, and fruits).
bee keeping
benches
butterfly garden
decks
decorative gates (may be free standing)
dog run or kennel
edibles (veggies)
fences (accent)
fences (privacy)
fountains
fragrance garden
gazebo
greenhouse
ground covers
hedges
herb garden
hot tubs
hummingbird garden
Japanese garden
jogging track
moon garden (plants and lights for night time viewing)
orchard
ornamental grass garden
other groundcovers
out buildings (like sheds)
outdoor theater
overhead sunshades
parcours (exercise stations)
parking area
party room (free standing for games, theater, pool table, etc.)
patios
picnic or barbecue area
play yard for children
ponds or garden pools
pools
potting bench or shed
putting green
rock garden
rolling hills
rose garden
screened rooms (free standing)
screens (foliage hedges or growing on a wire mesh)
sitting or reading area
sports courts
statuary
steps
storage buildings
sun room (free standing)
swimming pools
tool shed
topiary
trees (shade)
trees (accent or decorative)
tulip garden
vining plant garden
walkway (formal paved)
walkway (informal path)
walls (retaining)
walls (accent or decorative)
wildflowers
Zen garden