My first advice would be to look into the resto costs to determine if it is worth it to you.
Caveat: I love Asteroids. I have a dedicated Asteroids.
Vector monitors are not cheap (to the point that I wouldn't even put a price on one right now as the geographic fluctuation is so great since local deals are snatched up in a hurry).
Asteroids PCB sets (and power supplies/boards) are less difficult to come by. Be sure to include the cost of a new "big blue" capacitor on the PS ($12).
Artwork is readily available (although I think that artwork can be touched up nicely and may not need replacing). (Overlay is $35-40 and Sideart is $140ish ... all prices according to my notes).
Monitor plexi bezel and cardboard bezel are easy to obtain, but not cheap ($45-70 and $25, respectively).
If you had the "Owl-Eye" coin door, inserts are available for about $4.
Can't tell if the volcano buttons are in and working (my bad eyes), but there are those.
Oh ... and you'll need a wiring harness.
For me, $95 is too much for a shell without the plexi bezel or owl-eye coin door, but tough to say depending on local demand.
But .... I LOVE that game ....