The preachers are way too much money. If you want to do them buy an adjustable/incline bench and you can use that to do one arm preachers with a dumbell but it will also serve many other purposes. Personally I dont even like preacher curls that much(I do them sometimes, but they put a lot of pressure on my wrist) and I feel that when it comes to home gyms you need to get basic stuff first like a power rack, bench, and dumbells.