I like small diaphgragms on double bass, often I use one of the new C451B's. But it depends on the playing style. For any fingerstyle playing (rockabilly, country, or jazz) I usually use an SDC (your C60 or C451 would be nice) but for slap I put the mic high on the instrument (towards the fingerboard), pretty close (maybe 20 cm away from the fingerboard), on the treble side, and move the mic around a bit until I find a nice balance of slap and tone. I also like to err on the side of a bit less slap sound, because if you want more slap sound then if you compress the bass at all the slap comes forward. It also depends on the bass. Some basses sound crap and there's not much you can do to get a nice tone.
For more jazzy stuff (where I don't want too much finger sound) I move the mic down and also further away (maybe 30 to 60 cm in front of the bridge) then I move the mic around to get a nice sound. If there's a lot of fancy playing where you need articulation, tracking a pickup+DI might be wise.
For arco, I like the sound of a large-diaphragm mic, a U47 or something like that. Maybe the ribbon would sound nice. A darker mic tends to tame the scratchy sound of the bow when it's recorded, leaving a more full 'bassy' sound that you hear at a concert hall, IMHO.
Placement is pretty critical - basses radiate in strange ways and modes depending on what note is being hit. It helps if the player is 'in tune' with his bass - some notes really speak out and the player needs to adjust.
About 90% of the bass I record is myself, and it's about 80% bluegrass and rockabilly.