You are asking that question to Jeep enthusiast... Jeep Enthusiasts--- A family of people known for dropping thousands and thousands of dollars in to 20+ year old Jeeps, adding parts worth way more than the Jeep is anymore.
At the end of the day the main factors come in to play. How much do you love that exact specific Jeep of yours? Do you love it enough to spend that money to keep her going? Another thing to think about is how much in mods does she have so and do you want to start all over again? If you got 3 grand or more in suspension plus a grand in armor etc etc another $800 would probably worth keeping it running.