EcoCredits: What is the best accessory or perk to redeem your forum rewards on?

I was looking at the rewards center and noticed you can redeem EcoCredits for various physical accessories, cables, carrying cases, or even discount coupons for future station upgrades.

For those of you who have been active in the community for a while, what do you usually spend your EcoCredits on? Is it better to just hoard them for a massive discount on a larger unit down the road, or are there specific accessories in the store that are an absolute must-have and worth grabbing right away?