Sleeper builders...

[TATsoul]

I haven't seen anyone mention Don Colling. He builds both coils and rotos. Super solid builds. Everything is a one off and his rotos are hard to come by. And to date I don't think i've ever seen someone resell one of his spinners.
https://www.facebook.com/#!/don.colling?fref=ts
For coils:
Bowery Stan Moskowitz is pumping out Jonesys built the old school way that Jonesy taught him.
https://www.facebook.com/#!/bowery.moskowitz
Jay Brown is another old schooler pumping out some nice coils. Due to health issues he doesn't tattoo much anymore. He's got some great deals on coils right now because he's trying to raise money to support the Northwest Tattoo Museum he started.
His FB:
https://www.facebook.com/#!/TattoosbyJayBrown?fref=ts
The NW Tattoo museum page
https://www.facebook.com/#!/NorthwestTattooMuseum
Also Larry Hanks is building the coils too. He casts them himself and sells raw frames as well. He's either in AZ or HI depending on the season.
https://www.facebook.com/#!/larry.hanks.31?fref=ts
Last but not least Ben Euse, my main building mentor has been stepping up his coil game as of late (Thanks to Jay Brown). He's also tinkering with rotos, but he won't officially come out of the closet yet...
https://www.facebook.com/#!/ben.euse.5?fref=ts

Cheers!

Jay Brown coils are really nicely made the oldschool way. We will be carrying them in the next two or so weeks and will also be spreading the word for his museum as well. Very cool guy that really cares about the industry.

-Billy

[hendricksonart.com]

Those dickie golden machines wow most impressed with those out of all that were listed. Of course just looks any one ran one?

[Jzmtatu]

I humble offer you build a machine for you. I build for a couple years only not that long but if you tell me what you are looking I can make you a good decent machine. I have do a lot of research on coils materials electromagnetism plus I have use myself so many brands during all my years of work, I actually will like to thanks all the industry for so much info available now day Bill Baker my respect for you and for the inspiration from all the guys like seth ciferri, aaron, soba, pike, infinite, micky sharpz, danny, and too many more to mention, pretty much I will call my machines magnet fusion but this name is already use it by the inks but will love it just don't have a name jet. I have to models with shorty coils but they run really good, just need to know for what type of needles and application you need it. I been tattooing for few years you can see my work in instagram as cubaninker and I have pictures of the two model machines I been working on the last 2 years, is like a mini roger a call atom. right now I only do it blued but soon will powder coat them for a better look and finish.
Thanks
Regards

[Eturnus]

I think newbreeds makes a pretty clean looking coil.

https://www.facebook.com/newbreed.machines?fref=ts

[SKreitlow]

I really like T's machines https://www.facebook.com/electricsoultattoomachines the few I have ran have been super smooth.

[nivek]

Seth - everyone should own at least one of his liners
J. Puente - possibly the smoothest shader I have ever used
Tommy Stegall - great machines
A Cain - Kinda given but just such great machines
Lucas Ford - great light punchy machines
DJ mInor - heard nothing but great things about his machines.
Jeff Zuck - he doesn't make a lot of machines but god DAMN I love the shader I have

I know these may not be sleepers but ..

[blackmasstattoo]

Karl Hedgepath

[upinarms]

If you can get your hands on a shankmade machine they are insanely amazing lil pieces of workmanship...extremely hard to come by as well

[mattmillerink]

I really like T's machines https://www.facebook.com/electricsoultattoomachines the few I have ran have been super smooth.

I can vouche for T. Massari and his machines! I got a soft shader a awhile back and it's my daily driver for BnG still (and he repainted it to my favorite color to boot). I live in Lancaster which helped getting it quickly since I hate waiting for shipping. Also really great guy too if you ever do get a chance to meet him.

Mike Pike is here too. Might try to hit him up. I didn't know he was so popular until coming to this board ha!

[inkkbully]

Dewey Smith- Orphan Irons
Joe Martinez -Futuristic Antiques