LTR is the best visa available if you qualify for it. Its cheaper than the other options long-term and offers much better benefits, including tax free status on foreign income.
most agents are no longer offering bank account services unless you also purchase a non-immigrant visa service from them as a total package. I don't know if any agents that still offer assistance opening bank accounts for people on tourist visas.
Originally the banks were telling people that they could open accounts if they were married to a Thai or owned property in Thailand, but I've also read reports that banks are saying that's no longer the case and shutting those accounts as well.