I've recently started using Belgians exclusively--blue and yellow. I think they're all you need to keep an edge shaving wonderfully.

You could get a combo blue/yellow and be pretty much set. If you needed to work out chips, you could use sandpaper, or an inexpensive diamond hone like the smaller DMTs.

Howard uses a DMT 1200-grit, then a Belgian blue and yellow. I'm finding this is a really effective and quick way to get eBay razors up and running--lots better than my old sandpaper/Norton setup.

If you were patient, I'm sure you could get eBay razors shaving with only a yellow, though. With a slurry the coticule cuts quite quickly.

If I only had to have one hone, it would be a 6x2" coticule.

Josh