But what brand/type/style of hardware is best for longevity and noise level?

Try RealSlidingHardware.com they have high quality lasting hardware and beautiful barn door kits that are great for interior sliders. They also craft custom doors at RealCarriageDoors.com

Hi crisrob, this is a Z Barn Door Style and we sell these doors as kits you build yourself. They are made of solid alder wood. The hardware is similar to our Industrial Barn Door Hardware you can find this on our website.
Z Barn Door: http://rusticahardware.com/z-barn-door/
Industrial Barn door hardware: http://rusticahardware.com/industrial-barn-door-hardware/

The lower end of the door, how? Is the bottom rail?

Rustica hardware they take 10-12 weeks for delivery. They also have great rails and wheels to choose from in diff varieties.

Check out our website www.nwartisanhardware.com for more!

Hello,

This looks like our Classic Flat Track Hardware with an Offset Pull. Most of our hardware ships the same day it's ordered. The project looks really great and the door is awesome, great work K & K Custom Cabinets LLC!

In terms of noise level and longevity, our hardware is built to last (robust ball bearing wheels, 1/4" steel, and a durable powdercoated finish). For an ultra-quiet experience, check out our hush wheels!

If you would like to see more hardware, go here: http://www.realslidinghardware.com or call us at 1.800.694.5977, we'd love to chat with you about your project!

If anyone is in the market, we sell the sliding barn door hardware for these type of doors. Our styles are very similar to these. We also have the door pulls available. Our hardware is very sturdy and can be customized to fit your needs. Out tracks are very easy to roll and very quiet! We have a powder coating facility on site so we can even customize the color of your track! If you have any questions feel free to contact us.
Website: http://www.basincustom.com
Email: info@basincustom.com
Phone: 208.261.1270

Martha- I just installed one of these at a clients in Goodyear. I got the hardware at Rustica Hardware and had my contractor make the door. I think I could've ordered it for less from RH though!! Let me know if you would like pricing!

I'm looking for a barn door and IDB Interior Design you mentioned RH. Can you direct me to RH website.