Dear Kate,
I'd first do this:
1. I'd change the header in the first place - make it stand out in the crowd.
It's either remarkable or invisible. I'm not sure it gives that power to make your first-time readers say "wow", I'l stick to this blog and see what's all about.
Then I'd ...
2. Add an AWEBER opt-in list (feedburner/RSS subscriptions is NOT enough anymore!)
Up to 98% of blogging mentoring students are using AWEBER because it's the best. There's no other alternative like it
Hope it helps...
Next question(s) please!