Just keep it and and build one.
E92 all the way for daily driver. Its much safer and much more comfortable. The older BMWs are nice but are lacking in today amenities. The older cars can be had for dirt cheap. You can save alot of money by doing it yourself and if you're impatient, just pay a shop to do it. I'm building one right now...
I got an E30 shell with a M30 motor from an 635i being built. Plan is to go single turbo once I get the swap done.
Total project costs so far:
E30 1986 4dr shell : $350
M30 motor: $150
M30 manual tranny: $200
Custom Motor mounts : $300
Torsen LSD: $250
Reworked Driveshaft : $350
I'm in the midst of putting it all together. I'm just missing a clutch / brake pedal assembly! (shell was an auto).
Things to buy for turbo down the road:
Turbo manifold : $800
Turbo : $500ish
Megasquirt : TBD
I'm hoping everything comes together under $5k. It'll be a pretty quick fun car. I wouldn't daily it because the e92 has me spoiled rotten with lumbar / heated seats / keyless / Sat Radio / bluetooth etc.