If you live in the US/Canada, don't bother with multi-zone. There's a reason why people outside the US/Canada go for multi-zone mods...but really only use zone 1. The US has more (much more) titles than any other zones, and better authoring/quality. I have many zone 1 discs....I have 8 zone 4 discs. I finally decided that buying zone 4 discs is not worth the hassles, because:
1) Sometimes the quality is no good (authoring).
2) Not many extras on the disc.
3) One of the major distributor here likes to code MPEG 5.1 as default, including the extras. Which means I get no sound coming out of my digital out and have to switch to analog.
4) My collection of zone 1 discs exceeds the range of zone 1 discs released so far!

Australia tends to get a lot of masters from the UK, so my dislike for zone 4 discs goes to zone 2 as well...Also, I keep reading in UK magazines that the DVD authoring for zone 2 discs are not as good as zone 1 discs....so I'm staying away from them. Plus they are not cheap to buy.

I tried looking for zone 3 (Asian) discs. Some countries censor the films, so I am not interested in getting them. The Hong Kong titles are very expensive, even in Hong Kong! I have seen many Hong Kong films, but I'm not sure if I really want to pay almost twice of what I pay for a US title for a Hong Kong title. Plus in Asia, you don't know if you're paying a lot of money for pirated video copies or not. A friend bought a Japanese made copy of Titanic. Cost him about US$30 to find out that it's pirated from the cinema! (As in, somebody took a video camera into the cinema to record it and put it on DVD to sell.)

Example 1: The very first DVD title I bought was Evita. It cost me $49.95 (about US$32) and it comes in Dolby Stereo 2 channels. US version costs less and comes with 5.1 channels.

Example 2: US version of Mask has deleted scenes. Australian version doesn't.