With my first $5 I'd be tempted to get Ghost Ship over the HoP. The mining village that you already have works well with GS. GS works even better in multiplayer, since you don't have to play GS every turn to hose someone. Your opponents can "help" you by playing GS.
HoP doesn't work well with handsize attacks and there aren't many $2 and $3 cards that you want to spam. Also to make HoP really good, you'd need an engine so that you could play a lot of cards every turn for the HoP. This doesn't seem like the board for that.