Gold boost items are the only one that retain their value with your king levelling up that are not mask or cape. Whether you are a king < level 50 or one at lvl 70, the gold boost percent will give same results unlike other items where you need to constantly upgrade. For mask and cape the primary one will need upgrade so even if you have a 15% gold boost, they are worthless in a months time.
If you want to spend money in initial game, spend on gold boost.
I used to be full gold boost equipped till now but recently changed a bit. Thanks to dungeon, I got a 13.6% wind boots (Not great but I still love them) and for mask, even though my i have one with 9.6% gold boost, I prefered a new one from dungeon with 600+ leadership boost. The result is a big boost in me winning most of the battles 100% thus triggering fortune chamber also. I am convinced, unless you can clear the base 100% with gold boost on, you are better off using wind and leadership for boots, mask and cape.
I just got a nice fire shiled with suit from dungeon and till now my best suit was with a normal shield. The increase in health was more than 900 from my previous fireshield one so I used the normal one for 3 weeks till today. I am not sure if the normal shield has any protection from arblasters as they are the ones I fear most other than gorgoyles and Snake towers. Between your suit and pauldrons, one should be high fire shield and other poison shield.
For Glove and Sword, like sn1kt mentioned in one of his youtube videos, I prefer frost or blunt. I currently have a frost one. very helpful with barricade and skull tower when i dont have my spell recovered yet.