I've actually just returned from a hiatus myself, from Gadgetzan to mid-KFT. Got really screwed over by Blizzard on 50 Gadgetzan packs, due to the high frequency tri-class bug, and my account wasn't recompensated.
If things looks stale for you, switch between Standard and Wild... however Highlander Priest is cancer in both formats.
Good idea on saving your gold. Maybe try out the Dungeon Run before you go though?