Take your time.. the way things are now with the lack of parts. Everything is overpriced. Get a 2nd hand upgrade if you can (but check it first) Sometimes computer stores sell their demo stuff and so on. There are bargains out there. But ultimately, Blender exists.. and maybe things are slow because of the renderer itself (even personally though Blenders UI irks me tremendously, and I don't use it much myself for that reason) Check your options.. that's all I'm saying.