First of all, congrats on having very good options! I see three options:
1) Most industries seem to have an unwritten rule thag anything less than a year or eighteen months at a job without a supercompelling reason looks poor. If it is a one-time leap, I don't think anyone would look at it twice, but again, I don't know the particulars of your industry. In other words, stay put for anothet six to twelve months, then look at options.
2) Screw it, take the job. The optics of returning to a previous employer are obviously different than going to a new job, and your number one obligation is to yourself and your financial obligations. You can build a good narrative around why you went back to this company, and people who know you will understand.
3) Leverage your old company's interest in you for a better situation at your new job. This is the trickiest plan, but long term might be most lucrative. Go to your current employer and say "I sure like it here, but I have an obligation to listen to what my alternatives are. Can you make it more attractive for me to stay?". High risk, high reward.
Good luck! You seem to be in a great situation.