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As has already been said, I'd be more concerned with the short journeys you do rather than the issues related to keeping it outside. Cars of that vintage are much better protected against rust than the older stuff and, although they will still rust, if you keep on top of it, keep the underside clean and attend to anything that does come through before it gets a hold, then it should be manageable.
However, the cars you're considering have big engines that won't be getting properly warmed up on a four mile journey. Doing short trips in the long term is just going to lead to future problems - bores get washed from being in cold start mode too much, condensation builds up inside engine/transmission/cats & exhaust, oil gets diluted with fuel from all the running in cold start mode, etc, etc.
Giving the car a decent run (20+ miles) in between all the short runs can help to offset some of these problems, and changing oils more often can help too.
One final point for you to consider: anything built in Japan (unless you get something that's been seriously abused) is going to prove more reliable than a 20 year old Jag, as nice as they are!
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