I've been doing some tracking (pedal steel) and one song the client wanted Dobro. In the past I've used an SM57 and SM58 for the Dobro but not really happy with the sound. I have an MXL R144 Ribbon mic (bought on a M/F sale) and tried it. I've used the Ribbon as an "overhead" for drums in the past and it did good. I tried it with my Regal Dobro and what was recorded was exactly what I hear from the Dobro!

I ran the Ribbon mic to a Focusrite ISA One preamp to my MOTU recording interface unit.
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I use the R121; love it!
You can hear it here

I've had this Lorado Dobro for years and I often bring it out when we play our bluegrass sets. It was great in this one band as there was already a guy banging away on a Martin. so it added a different sound.  I don't play it with a slide but I like to play alternate chords that are higher up, like a moving "D shapes. I use it on a few songs in the duo we have just to change things up. 
 
 
Most times I've used a SM 57 but I have trouble when I sing remembering to work the mike properly. 
I still use a mike but I need a steady level for rhythm. 
The thing was a bugger to figure out how to install a PU. No way to do a saddle PU or contact PU and even this mini humbucker up on the neck,  I tried everything but it didn't pick up the resonator. 
So I found a solution and it sounds great. Get this- I bought a pair of vintage  Akai (dynamic?) mikes, Those little plastic things you got with your 1970's  reel to reel. $3.99 from Goodwill. They have molded cables with 1/4" jacks. They look and seem to work like a Small Cap Condenser. So I put one inside in the lower right mounted in high density foam pointing up at the back of the resonator and hardwired to an endpin jack. 
 
I get pretty good level before feedback and then I just get close to the SM 57 for leads. 
I haven't had a chance to record with it yet but we are going to do another album over this winter so I'll give it a try. I probably blend that with what I normally used before and that is a small CAD condenser mike. 
http://www.musiciansfriend.com/pro-audio/cad-cm217-condenser-mic--buy-two-and-save
 
They used to go on sale for like $60 stupid deal days. 
I would think a ribbon mike would sound great, Not a big fan of MXL mikes, I bought a MXL LD on sale from MF deal for $100 and I ended up giving it away as it was pretty bad sounding compaired to all my others. But thats only one so I guess thats not fair, but I wrote them off as cheap Chinesse stuff. 

I'm not a big MXL fan.  I've bought some cheap condenser mics and they were that - cheap condenser mics and emphasized the highs and they were sold (cheap).  But the Ribbon seems to work good, or I just got lucky and got a good one.
 
 

I love my mxl ribbon.

It sounds just like my Royer. It is probably more fragile, but I've never replaced a ribbon yet.

For a long time I used a Fostex MRP88 to record my (ancient) Duolian - it's a bear to record, but that worked quite well. When I finally picked up a pair of Royer R-101s they became my favorites. The thing about the Royer ribbon microphones that fascinates me is that it is darned difficult to find a bad microphone position - some are better, but they seem impossible to misuse. If you can do give them a try.

the cascade FatHeads are affordable and very very good

I also have the MXL R144.  I had to get a CloudLifter just to get any level out of it.  But with the CloudLifter, it is awesome!
 

Just for fun I clipped a little iRig Acoustic Stage mic to one of the holes in my Washburn R60RCE electric resonator and it gives a surprisingly good sound.  Not a first choice, I'm sure, but it adds a more true resonator sound than using just the lace sensor pickup alone.  I use them blended to taste.