How important is a preamp for purely digital sources?

Interesting discussion. I've been running a modified Oppo 203 (digital only) to a Lampi Atlantic TRP dac, and then directly to ATC SCM19A floorstanding actives (and soon JL Audio e-110 subs). The ATC's are balanced but I'm using faux balance, i.e., unbalanced, out of the Lampi. Before the Lampi, I used a Directstream dac from the balanced ports for a few years. Since getting the Lampi, everyone I speak with, users and developers, say I'll get more out of it with a good tube preamp in there. Most of the ones I've been looking at are in the $3700-$4800 range new, which is out of my range at the moment (Rogue RP-7, Linear Tube Audio M3Z, Wells Commander, PrimaLuna Evo 400), so I've been eyeing eyeing PrimaLuna Dialogue's on the used market, which look like they can be had (with bargaining) for around two bills. I came across the Schiit Freya+ mentions today and read reviews and user comments, but I don't think it matches up with the PrimaLuna in any fashion except having XLR outputs and much lower cost. I should also say that I like a modestly warm (but not lush) sound, something emotionally engaging with the music rather than the "sound." Other suggestions or thoughts?