None of these are modeling units. They're preamps with a DI.
Out of these, the SCR-DI will be the best fit for a classic rock tone.
Exactly! There's actually only been one or two modelers mentioned and there none on your poll. If you just want a preamp, I'd determine your budget first...
For not much money, you can get a great sound with a BDDI v2, a VT Bass DI, or the SCR-DI
For a bit more money, you can get The Two Notes LeBass, Broughton Messenger, GK Plex, Mesa Subway DI, or Aguilar Tone Hammer. Even though it's at the very top end of what I'd consider mid-priced, I'd look at the Shift Line Olympic MK IIIS
For a bunch o' money, you can get a Noble, a Verellen Meatsmoke, or Jule Amps announced a pedal preamp that supposed to be similar in tone to the Monique(I've got my eye on this).
You can do the same thing with modelers.
For a reasonable amount of dough, you can get the Zoom B3n, or the Vox StompLab
For a lil' mo' scratch, you can get the Atomic Amps Bass Box(I've got my eye on this, too) or the Line 6 HX Stomp
If you can make it rain, you can go top shelf and get a Line 6 Helix, or a Kemper Profiler. I'd mention Fractal, but they don't seem to give a rats @$$ about bass, so take that for what it's worth.
You can get great tones out of all this stuff. Some will say that a preamp alone might sound a bit, dry, and could use a cab sim. Almost none of the preamps in your poll have any kind of cab sim except for the Sansamp and the new Darkglass stuff. You might wanna consider a cab sim pedal. OTOH, all of your modelers will have some kind of cab sim built in. The upcoming Atomic Amps Bass Box is supposed to be coming in at around $300, which is the same price as their HIGHLY regarded guitar version, the Ampli-Firebox. My guitar player uses one and loves it, which is why I'm leaning towards the Bass Box. My goal is to have a complete live rig, with or with cabinets, on my pedalboard.
Sorry that was so long, but I'm really starting to get into this modeling thing. I don't know much, but I'm excited. Good luck!