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Car, auto, automobile, vehicle
For “car” you would need PR8 to have any chance of making the first page
For “automobile” PR7 could get page one
For “vehicle” PR7 could be enough to secure the first page
For “auto” PR 6 would do the same job
By doing this you can obtain good placement for related keywords or phrases and allow your PR to build. By assessing the market you will be able to re-optimise your site for better key words when it becomes possible or practical.
:)
I'd suggest, however, that you will get more bang for your buck if, when looking for new phrases to conquer, you optimize not for more competitive keywords but *more* less competitive keywords, which you can secure with increasing ease as your PR climbs. Since, as Brett has pointed out several times, the vast majority of hits come through pages other than your index, targeting different key-phrases on most every page of your website seems to be an effective way to increase search engine traffic.
In fact, this may well be the wave of the future, as search engine users struggle to avoid less relevant high-pr sites and become better at creating focused queries likely to be of high relevance.
The main point is that your time can often be more effectively spent on loading up the less competitive keywords than struggling to place somewheres in the top 20 for really competitive ones.