I have, use, and prefer the Spire when it comes to high-end loaders. That being said, Rotors are getting very cheap now, and for the price you can get them for nowadays they're tough to beat. Get one of those and it'll serve you very well. I've heard good things about TFX's, but I've never used one so I can't say for certain.
If you weren't looking to spend more than 50 dollars, older high-end loaders such as the VLocity and Prophecy V2 (not Z2) are amazing loaders for the money. They lack a few of the convenience features of the new loaders, but they'll do the job just as well.