Leadscrew upgrade

Hi all!

It recently came to pass that I'll have to do the lead screw upgrade to my R1. Looks like the kits are sold out.

I was looking at Amazon and it looks like there are several options available, so I'm not sure if any particular one is better or if it really matters. I can't post links yet:
- Iverntech NEMA 17 Stepper Motor with Integrated 300mm T8 Lead Screw
- Redrex Nema 17 Stepper Motor 310mm T8x8 Lead Screw Integrated with 1.5A 40Ncm/57.1 oz.in
- SainSmart NEMA 17 Lead Screw 265mm Stepper Motor M8 Z axis

Is there any one of these, or a particular one, that you guys would recommend?

Also, I am going to need to have the adapters printed since my machine is currently out of order. Any place you recommend ordering small parts from?