I would make alternative arrangements. I can't see Silverjet trading next week.
Ask yourself 2 questions.
1. Would you book with the company now to fly to USA?
2. If it was possible, would you invest your cash into the company?
Book with an established carrier such as bmi or BA. I hesitate to mention Virgin as there are noises coming out of that company that are not good.
Good luck and pay with a Visa card.