My family dug and installed about 300 ft of 1" PVC piping in the ground, with several hose spigots along the length. If your house water is pressurized, it *should* be able to get up a dozen feet (think: the 2nd story of a typical house). As @Skandi says, the larger internal diameter helps preserve pressure better along that length.
PVC piping is dirt cheap. The pipe connectors are a tad more expensive, but can be bought in cheaper contractor 10-packs at some stores (such as Menards).
Just make sure you have a drainage location at the low point of the pipe, so you can drain the line for winter. We just dug a 5-gallon
bucket into the ground at the low point, with a few holes drilled in the bottom, and run the pipe into that bucket, with a drainage valve (to drain, don't forget to open the spigots at the top of the hill!).
[Edit:] Like Eric, below, I also use a drip system. The point of my PVC piping is to bring spigots closer to my garden and
trees, and then the drip system branches out from the water spigots for everything. Otherwise, I doubt I'd get enough pressure for my drip system.