For something that small, I'd think a good sized dozer is all you need. The more equipment you have on a site, the more money it will cost you. Get a guy with a D6 sized dozer to dig your hole and spread the dirt to create your dam.
$1,000 per day is a safe enough number for estimating. You might find cheaper, but it all depends on how busy everyone is in your area and who you end up with. I'd also agree with Mark that a week is about right for a pond that size, so $5,000 sounds like a good working number to start off with.
A good fishing pond has a variety of features to it's shape and bottom. You don't want a pretty, smooth bowl, but a jagged, rugged hole in the ground with steep sides. The depth should be from four feet to about twice that if possible. Remember that in dry times, the water will drop and you want at least four feet of water here in the South at your worse conditions. Deeper is better for the reason that you have more water to lose to evaporation.
Your spillway is one of the most important aspects of your pond. If it's not sized big enough, or located in an area that can handle the most extreme rains you ever get, then it will erode and your dam will fail. I don't know the exact numbers, but most dam failure is from the spillway not being able to handle the water running through it. I'd say all, but I'm sure there must be other failures for some reason other then the spillways being too small.
Pipes have a limited amount of volume. It really doesn't matter how big you go, sooner or later a pipe won't be large enough. If you use a culvert pipe, be sure to have a plan to handle excess water over an emergancy spillway.
I have two ponds, one is 3/4 of an acre that I spent two months solid digging with my backhoe. The average depth is 5 feet, but two areas are over 8 feet deep. I put in an island just to cut down on the amount of dirt I had to move, but otherwise, it's just a place for my ducks to be safe from preditors. I dug it with my backhoe and hauled dirt with the front bucket. One yard at a time, all day lone, day after day. It was a massive amount of dirt that took me another year to get rid of.
Even if it costs twice what I'm guessing it will cost, go for it. There is nothing like having a pond on your land. It adds more then just a fishing hole, it becomes the focus of your land. Money is just something to spend, you might as well spend it on something that will last forever.
Eddie
Eddie did a great job documenting and photographing how a dam, spillway and the piping system is built.