Quality arcade sticks are expensive. If you think about SF or Tekken seriously, you need something like a Razer Panthera, Qanba Obsidian or a Hori RAP4 Kai (this one has the best price-quality ratio according to many people).
It also depends on whether you want a Japanese or a Korean stick, they're quite different.
I'm using the PS4 pad v2 as I feel comfortable with it and couldn't justify the expense.