I'm slowly working on DH

I'll get my way eventually!
I'm having a dilemma of my own....
As you all know, I've been awaiting my new partner. She's finally hired and starts dec 17. I will be back to my alternating schedule by dec 27. With the retirement of our business manager 6 weeks ago, things at work have gone downhill -- new business mgr is anal and controlling and trying to get me to do coverage for another position (stock keeper) which is not what I applied for! Physically I can't do heavy lifting, I applied for admin/reception 2.5 yrs ago and have never had to do stock keeper for our last boss. This boss is all about cross training, etc..... But I have no interest in training on stock keeper position!!! That's just the tip of the iceberg .... Work is not the same without our old Business Mgr....not to mention. she was a Disney fiend like us!
Long story shorter... I have an opportunity to move out of the young offender Center to next door / the big spanking new remand facility (adult inmates) that was just built. There is a data operator position in inmate accounts. It would mean a promotion/ going up a level from an admin 2 to a admin 3 -- double the salary and full time. I know I said I like part time, but this offers new opportunity and challenge, and may keep me busy!!! I love data entry. I'm so bored in my current job. There is a lot of down time with nothing to fill it. This new job is in a huge, busy state of the art facility.... Serving 800 staff alone, and a couple thousand inmates. I think I'd be kept busy.
It means interview process again (which I hate) but a good chance of success as its only open to current dept employees. Now I need to choose -- lazy and easy job or challenge and busy full time job? I am tempted to apply and see where it might take me. I have until Tue to get my application in....and I am wondering whether I should go for it! Sorry for the long post, my mind is going a mile a minute right now.
Thanks for listening!!!
Marie