Way out here in Orygun we had the electric and phone plowed underground most of the way from the power company's last transformer. They ran something like 7000 volt direct burial wire. It was laid 30" deep (I think) with a vibratory plow behind a bulldozer. I wasn't there or I would tell you the size and brand.
The 7 kv line goes to a transformer near the house and the only trenching is from that transformer to the house. The phone line was put in at the same time, but spaced about 24" to the side with a second head on the plow.
We went about 1300 feet, and the cost was much lower than $25k. The wire is inexpensive because 400 A at 240 V is only ~14 A at 7000 V. The transformer is a couple thousand, but it is well worth it.
It doesn't really matter what the electric costs, putting your house in the center of your property is a good idea. I can give you one very good reason. I once looked at a house where the real estate description sounded great. But, the owner had built his house close to the road and on a flag lot, just like yours. After he built the house, a neighbor built a stable. He put the stable as close to the property line as he could and as far from his own house as he could, which placed it about 50' from the house we were looking at. Everything was legal and there was nothing the owner of the property we looked at could do, but the house was not ever going to sell unless they found someone who loved the flies from other peoples horses.
If you own the surrounding land for a distance you have control over this. Otherwise, you would be amazed at the nuisance normal agricultural practices can cause near a residence and you have no control at all.
P.S. Rural dsl internet is very hit or miss. We were 2500 feet from the switch, and the promised 3 mbps was more like 1.2 on a good day, dropping to less than 25% of that if it rained. And the latency, a number few people even think about was vey high 250 ms or so. If cable internet is available check that out first. Cable comes within 0.5 mile of us, but they will not extend their area. End of discussion. We ended up with microwave internet, which hits the 3 mbps mark and has latency of about 20 ms. This is not available everywhere.
Knowing what I know now, I would be certain of the availability of internet before I broke ground. DW works from home and internet is essential for us. We lucked out after the fact, but I would keep on looking for property until I found something with good internet. Satellite internet is better than dial-up, but has huge latency issues.
P.P.S. While you are building, make provision for a back-up generator. It will never be easier or cheaper. Rural areas have many more power outages than urban or suburban ones, and they tend to last longer. We typically have 2 to 6 outages per year, which last 4 to 8 hours each. And, we have short outages compared to many people. There is a transformer yard about a mile away, so the service crews give our area priority. 2 years ago a number of people we know were out of power for several weeks in the middle of winter.
I just put in a nominal 15 kw generator which runs from our 500 gallon propane tank, and which can run on gasoline if necessary. In 3 months we have used it twice. Once for 4 hours, and once for one hour, although the one hour run was a fluke. The power went off at midnight, and we didn't notice until we woke up.
We have a light we can see from the house which is not on the backup generator. We turn it on when we start the generator, and know that the outage is over when we can see it come on.
