The Cash Shop armor is..interesting to say the least. It will only advance to level 30 in stats, but the bonus is something every level 60 player will be after. It increases EXP, as well as Drop rate and movement speed. It's a Mastery point grinding set at end game, but before then it has very little uses.
The level 27-31 Orange Set is better then the level 30 Blue Cash Shop set in stats/damage and the level 40 Orange set is even better.
You don't have to worry about the IM set for a long time (if ever).