I don't think anyone here can answer that question but you. I can sympathize though, as I am in a similar boat, although not as quick of a turnaround. I too hate switching jobs, it feels like a betrayal.

However, you should look out for yourself most of all. Does the extra income matter that much for you? Is it good for your career? What are the pros & cons of this new potential employer (commute, line of business, work environment, etc.)?

It's a difficult question, but one you have to come to terms with.