First off, congrats on the new bike — it sounds like you’re already having fun.
As to your class choice, I’m going to make an assumption that you’ll continue to have at least a few parking lot practice sessions over the next couple of months. If that’s the case, I’m willing to bet that you will have little trouble handling the Blast. It will be more challenging than the 125, but I doubt if it will cause you trouble.
Ultimately, your choice will be:
— Ride the comfortable and relatively familiar 125 and be better able to focus on some of the nuances of control
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— Ride the Blast and have the opportunity to spend some quality time on a different type/size bike. This could be both good and bad
I’m assuming the discount is pretty much a wash as your husband can use it for himself later. — That’s my 2 cents.