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If you're considering a 928, hold out for an '85 or newer. The '84 has the older, 16v engine that produces about 230hp. The 85-86 will get you 288hp, and going to an 87 or later produces 318hp. The GTS got into the 340hp range.
Timing belt failures can ruin the engine when valves hit pistons, which I understand can also happen with the 944 series. Water pumps should be replaced whenever the timing belt is replaced, usually every 4 or 5 years. I did mine 4 months ago and it took about 12 hours, but it was my first time doing it.
Electrical issues are most frequently the result of hack jobs and aftermarket stereo installations. My worst electrical gremlin was caused by an interior light housing cracking and grounding out. It caused the seat belt warning bell to chime constantly (fixed now, thank God).
928s have a bad reputation that is frequently exaggerated. We often get crap from 911 owners about the "front engine water cooled" thing, but take it in stride, even if it means avoiding PCA events in favor of events put together by 928 clubs.
I'd pass on the '84. Get a newer model with more HP and less mileage.
Dave
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