Welcome back, and props for even remembering your password after 9 years.
Not really enough info available to make a good hard call on what it's worth. Around here the winters really cut into longevity and most don't make it to their 25th birthday. If it helps any, the last two XJ's I bought were a single-owner '88 with <100k miles; stock with a snow plow and needing some attention for extended neglect - for $500, plus a soccer mom '96 with <100k mile stock as stock can be for $2k. Both 2dr models with low rust.
If you happen to find a 91+ model, you'd get the HO motor with upgraded/less problematic electrical and sensors systems.