You really shouldn't be doing any leves in your primary class until you're pushing level 20, and even then you probably have other content available to you. I'd consider saving them for crafting leves, as the rewards for turning in HQ items are quite good comparatively. 200% xp bonus for that. I mean if you're poopsocking from minute 1 of open beta, you might be able to burn through those, but why? You'll have so many FATEs and quests to burn through. I'd personally browse through the leve list and unless you see a really good upgrade in a weak slot, I wouldn't waste the leve and save it for something else. Also keep in mind, you should have the break between Open beta and Early Start/Release to accumulate additional leves. Depending on how that works out, you could end up with quite a few leve allowances.
WoW Blackhand-US-Date of Retirement: 9/21/2010... /Sigh
Devari - 90 Rogue 85 DK Druid/Mage/Warrior 70+
FFXI - Shiva "Retired.... Or not? One more try, honest."
Desmar - 65 Sam 36 Mnk 18 Thf 12 War
FFXIV - Devari Garamond - Sargatanas 50 Paladin / Culinarian / Weaver / Armorer
Beta - Devaria Ariadne - Ultros - Pugilist