Fish or cut bait

Decision time. What would you do?
Facts, 1983 240D, 140K owned since 133K, nice car but burns 1 qt per 469 miles and buzzes (clutch or driveline problem) Paid 2K for the car 5 months ago and have replaced timing chain, valves adjusted, misc repairs totalling $1500 so $3500 in it now.

1. Replace clutch (900 from indy merc or 600 clutch mart), do nothing about oil burning and have people behind me hate me.

2. Replace clutch, and have valve seals replaced (425) Seals may not solve the smoking or maybe for only 10K miles (stems and guides may be too far gone)

3. Replace clutch (900 or 600) and have a complete valve job done ($2000) total 2600-2900.

4. Sell the car.

I can't do any of the repairs myself so I am at the mercy of the mechanics (I do have much faith in him as do several of my friends who swear by him) What would you do?