WoW newbie looking for advice

[TriggerHappy]

Ugh, it's tough to decide what benefits me more, +31 more spell damage (which will make it +51 total by level 35) or +28 Spirit and +23 Intellect. The downtime with the spell gear is already noticeable, and will be even more so by next level when I get the aforementioned +51 spell damage and even weaker stats, as I exchange +stats gear for +spell damage grear.

It seems that I kill somewhat faster with the additional +spell damage (+20 is there regardless of anything else), but the downtime is kinda getting annoying. Guess I've been spoiled by Spirit Tap.:)
Probably couldn't play a Mage after this ...