On Winyandor, silver was 261, but gold an insane 370+, don't remember the exact number, closer to 380, I think. With only the email and Ashen Phoenix, I made it to 276. OK I did pick up a lot of currency around my city. Just went singlemindedly for steps. Started to open boxes as soon as I had 400+ currency and the board had at least 2 extra steps (one 3 steps box or two 2 steps boxes or better). Stopped after I got the bonus steps. Used magnifier and x2 when available, preferably together. Hope for at least average luck at opening the boxes and getting boards. If you have to open most of the board to get the bonus steps on most days, you're screwed.
If you really want a couple of one daily prize, you can do several boards on that day, but this will hurt your progress.
However, I do agree that if you finish all quests, you should get the full set (or a fully evolved building).