There is a more significant jump between Spirit and Sea items than for many of the other levels
I've had a lot of my mentees ask me to write a guide Last Chaos Gold here so they can check it out, so by popular demand I decided to a small write-up. Credited to Muiramir, he added ALL of this and thanks are due! Here's the skinny:
In the current game (Open Beta), there is a more significant jump between Spirit and Sea items than for many of the other levels; the rate of increase (slope) for Spirit is also fairly weak. It is probably more effective to hold off heavy enchanting until you are past Spirit.
On average in the mid-range at least, a level X item from normal boxes at +Y tends to be *very roughly* equivalent to a Level X+10 item from normal boxes at +Y-1. For example, the average damage output from a Level 15 Deep Sea Bow +2, a Level 25 Ogre Bow +1, and a Level 35 Assassin's Bow +0 are about the same.
I recommend looking up exact stats, but as a rough guide it is useful to plan your purchases and enchanting. If you keep good notes, you will realize that the increases do follow a series of formula, and you can predict quite accurately the stats for items you haven't seen yet.
However, the stones needed to enchant it will always remain one ahead of what the item you're plus-sing is.
