I'm re-doing the lighting in my home office with a more retro chrome single fc8t9 fixture. It came with a keystone kteb-1c22-1-tp-ws ballast. From what I read on here, keystone does not get much respect. What are my other options? Seems slim pickings for these circline bulbs.

Doing some digging.
Found an old spreadsheet from Robertson that seems to have compatibility for every bulb type ever made: RWW_archive.xls

From there, the ballasts with the highest "ballast factor" were all the non-magnetic electronic types:

ballast factor >.95:
RSW122C120WS
RSO122C120WS
RSM218CQMV

ballast factor ~.85:
RSO118CQ120
RSO126CQ120
PSM226CQMVDWCE

The PSM226CQMVDWCE is one of the ultra universal "digital" types with a PF of .9. The RSO126CQ120 is still being made, but seems to be a compromise to run either fc8t9 or a CFQ26W G24q lamp