I had the same need 6 months ago. I tried 7 legal firms that called themselves "disruptive start-ups" but they could not provide a) timely services b) a modest amount of customer service c) a fixed price or d) any combination of a) b) or c). In the end I went with an established law firm that did provide a), b) and c) but it came at a cost. You get what you pay for.