Definately compound the Halo, the highest HP compoundable DA head accessory = Rainbow Balloons, if you wanted a HP head accessory you should get that and keep the Halo for DA, since a base of 550 HP isn't much of a loss for the amount of DA you could get on the Halo :3 max is 48 DA
Yes, DO get the egg shop vest - since there has been no vest from the 2nd job boxes, we cannot guarantee an alternative vest in the future... the egg shop vest is hax enough though, we can temper it to a max of 45 (?) DA and if you compound it well, it can surely have 80~90+ DA on it :3
I'm going for a Crimson Sword, you should too if you don't mind the weapon having HV instead of LK, the DA can get pretty high, however I am waiting for 335 MyShop stones to compound mine (since 335 in-game ones are hellish to collect) so I have a temporary Queen Mace until they come out
Skip the Lion Hat if you're going to get the Goddess Circlet, I'm skipping it as well so I've been using a level 140 hat until I get the circlet 8D..
Inventor accessory has absolutely crap stats.. unless you're planning on spending money just to get 1 thing from the fox set (I don't believe the shield/cape/pet would be better in a 220 variant..) I'll go for an Altiverse accessory - a mix of Crimson and Maiden Queen ones, both are hax if you take the time to make them hax - they're just like boss accessories but the stats are way better, and a Crimson accessory can get 50 max DA/LK/HV/AC, which are all useful for a fox, and a max of 2.8k HP! If you wait for the 335 MyShop stones, a 110 DA accessory is in reach if you plan to hax it out!
Sounds like you're going to be a PvP fox, I suggest getting high HV on both Altiverse accessories and using a Goddess Shield (if you get one before the circlet, I did) refined for HV for fighting charm types since most of them don't have high AC (you can use the Goddess Shield as a permanent HP shield too if it has 3 slots or more, mine only got 2 though, 3s is so rare)
Hope this helps o3o