My dad uses Nufinish on the family rides, seems to work nicely and lasts a while if it doesn't rain or get dirty due to rain. Much easier than the Meguiar's 3 step I bought for my Si.
I think if you're not trying to obtain a "show car" finish, the Nufinish should be good enough, and last long enough for the majority of the population. But I'm not sure about price, since my dad buys it.
