I think you're pretty much going to be able to generate any currency you need, no reason to horde that much. And the absolute best part is that if you use the Etheric Light to upgrade armor (or however you upgrade exotics) you WON'T have to re-level, so any materials you pump into gear now can be upgraded without being lost. I've been spending Ascendant Energy and Shards freely as I prep an arsenal to beef up to level 34 going forward.

Other common tricks I hear is to do daily events, then leave the letter in the post office, as opening the letter grants 2500 XP. That way, if you stack up a bunch, you can quickly level a new item by just opening a lot of postmaster items.

I'm not stressing all that, though. I'm just putting together a dream arsenal and planning on which items to prioritize when Etheric Light starts rolling through.