You need more gain for a ribbon than a condenser or dynamic. And since ribbons have a natural roll off of highs, you probably want a preamp that doesn't dim the highs or emphasis the lows.
I just added a mxl 40 to my home batch - same mic as the 144 basically. It sounded good through a RND Portico. I have a Warm preamp and that seemed to exagerate the lows - probably not a good choice tho maybe on bass ... The Focusrite ISA seemed like a very good choice. High gain, clean gain w/ a hint of transformer thickening (not really necessary w/ the 40, tho) and the various impedance settings let you match to your ribbon. And the cheapest of the bunch - I got mine for $400 and they go for less on the internet if you look there. The ISA One is a great all arounder preamp, esp. if you are starting out. I don't know why more people don't brag on it. It works well on most sounds.
For less money I'm not sure. The Gap, like the Warm, probably has too much mojo, and I would be wary of any cheaper "color" preamps. A Rane might work but I don't know how much the new ones go for. The M-Audio is a duo for about $200 and has a goodly amount of gain, but I've never worked directly w/ it on a ribbon or anything else. It is something I would look at in the lower price range. Even your interface's preamps, if they have 60 dB or more of gain should work. The sound is in the ribbon more than the preamp for ribbon mics. It just takes a bit to drive it.
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