There are a lot, you'll get answers here. Some are Maggard, Razorock, Weber, Ikon, Timeless. You can also get good deals on complete razors, usually with DE89 clone heads, on Ebay with prices lower than handles only.
Timeless has a nice looking stainless handle that's on sale right now. They are going to discontinue it.
Threads matter. Imperial or Metric, coarse or fine. Assuming a three piece - what brand is the cap and base plate?