I am running my year 2000 1.8 Accord on LPG for about 3/4 years, and so far it's running great. I have a BRC kit installed and covered about 70000kms with no problems. Here in Portugal, the price for the installation of a 4 cylinder engine is about 1500€. I got the investment back in about 15/20MKms...
As Colin already mentioned, get a very good and certified LPG installer. If he is competent and a serious guy, he will choose the best for your car.
Also, Flashlube is mandatory for our cars, preferably an electronic one, which adapts it self to the engine speed. I fitted the Flashlube electronic kit when it came out, and since then I never had the need to adjust the valve lash.
Other than that, all I can say is: Go for it.
If you want any more info of the system or any pictures, let me know.