Should I leave?

So I realize that I haven't written anything in forever. I've done so much since the last post- I've presented research in San Fran and I've been to Hawaii and New York- and that was only this year, so I probably owe many more stories... but in an attempt to let it all out, I have to talk about this- even if it's only with myself.

I was offered a new job today. It's not a concrete offer but I could make it happen if I wanted it. And it's a good job- making 10 grand more than I do now... which is big considering I've been asking for a raise for a LONG time now but thanks to hiring freezes...

so here's my Pros and Cons List:
Pros to taking the new job:
More Money
Looks good on my resume
New Learning experience
Prestigious School/Lab
Brain Dissections

Cons:
The boss: very strict, doesn't care, abrupt, and cold
lose my tuition discount with UTD/wouldn't be able to take during the day classes
I'd have to leave Dan/BrainHealth

Part of me knows that this is the best possible opportunity. It would look really good for me and it's a big step up pay grade wise. But I just- I love Dan so much. Not only is he a great boss- laid back, easy to communicate with, objective and willing to get to the bottom of gossip and office drama- but he's a great person- honest and funny, ethical, a family person, brings birthday and holiday cards, makes the job fun. The other boss is known for being a hardass. He's known for being cold and short with people... if you're not good enough, he let's you know. Versus my current boss who will send me a thank you email after I do my job.

I have to think for the future- I want to get into medical school. I will get into medical school. I want to go to UTHSC-SA I think, but TCOM or UTHSC-Houston is good with me as well... I just dont want to be stuck in a job, miserable.

The thought of leaving my current boss makes my stomach turn a little bit. I'm emotionally attached- and I need to be able to remove that emotion and see the scene objectively- but just knowing what the daily interaction with this person will be like...

I just don't know what to do. I'm confused. Maybe sleeping on it will help.