Which online brokerage firm do you suggest for a Roth IRA?

I recently opened a roth ira with e trade, but have been reading a lot about a potential bankruptcy. I know my money would be insured because I am only investing $2,500, but I am weary of a company that might start to perform poorly. Do you have any suggestions for a firm that has low fees on their IRAs? Is it possible to transfer my roth ira to another online brokerage firm?...Thank you!