I'd definitely buy the following items from the Crown Store:
1.) Inventory Upgrades - Backpack, Bank, Guild Bank
2.) Level Up Packs - Increase character & skill level
3.) Craft specific Material booster packs - holds several varying quality crafting materials
Mounts:
1.) Undead Horse - rotted meat, bones and squirty blood coming out
2.) Dragon (That DOESN'T fly - learned my lesson on that one...

)
3.) Giant - riding on the shoulders of my very own Giant!
Pets:
1.) Undead creature(s) - I cant think of one at the moment but something cool might come up
2.) Werewolf - Having a WW as a pet would just be awesome
3.) Mechanical creatures from the dwarf ruins - robot that turns into a ball, mechanized spider
That's it for now, later folks!