Out of curiosity, where is your spindle wear evident ? Seal or bearing areas ? Seal surfaces can be repaired by using spindle savers, which can stretch your life out quite a bit, but if you've mangled the bearing mount areas you might as well replace them. If heat damage is evident, replace 'em. If you're unsure about them with slight wear, have them Magnafluxed to give you some piece of mind.
I posted this statement earlier tonight - don't buy imports that you can't be sure of the quality of the part. All of them are "CNC machined", material types are important (1045 is tough, 1144 is good, 1040V vanadium steel is used a lot in suspension parts nowadays), as is traceability to the manufacturer. Don't trust your life and the lives of people on the road to an unknown source, not to mention your prized possesion; don't sacrifice safety and quality in trying to save a buck. Just my opinion.
I have purchased fuel and brake lines from Right Stuff, well pleased with the quality, but I have not sourced spindles from them. As with everything today, if it doesn't say "Made in the USA", it ain't.