A lot of folks get frustrated with G5RV antennas as they feed them with coax attached to a balun at the antenna. The coax has a lot of loss at high SWR and so results are often mediocre. The original way to feed a G5RV is with ladder line to a balanced antenna tuner. This antenna plays much better this way.
The ladder line pictured in that homebrew stealth antenna article is home-made 600 ohm ladder line. There are kits out there to make your own 600 ohm ladder line or you can buy it. However, 450 ohm ladder line would work just fine. DX Engineering sells a nice center insulator kit that takes the strain off the ladder line where it attaches to the antenna wires. The wireman sells 450 ohm ladder line.
If you can swing it, it's best to bring the ladder line to a remote balanced tuner installed outside under the eaves of your house. A short run of low loss coax connects the tuner to your rig. Another way to do this is to bring the ladder line to a 10kw 4:1 DX Engineering balun outside the house and run a short length of low loss coax to your tuner inside the house. Why 10kw? The balun is going to 'see' a lot of high SWR and it needs to be pretty stout to handle this; a 5kw balun would work if you don't plan on running lots of power. The run of coax is kept short so that losses in the coax cable are kept to a minimum. Ladder line CAN be brought inside the house, it just takes a bit of care to keep the ladder line away from metal and sometimes RF can make its way into the shack. Do a search on 'a balanced, balanced, antenna tuner' to find examples of good balanced antenna tuner designs.
The higher you can make the apex of your antenna, the better. It sounds like your lot is rather small, so a dipole would be much too low at 80 and 40 meters. The inverted v will give you more of an omnidirectional pattern.
Here's a good article by L.B. Cebik, W4RNL (SK) on wire antennas: www.users.on.net/~bcr/files/backyard%20wire%20antennaes.pdf