Just keep in mind something that others haven't mentioned when they've said you gotta get your account up for your 2nd 1 year extension, if you deposit 65k a month for the full 12 months of your first extension, you don't need to take your account up to the 800k baht to apply for this 2nd extension
Im flying with AirAsia next month $920 return. I know that airline is average but it's a direct flight from Sydney to Bangkok and $300 cheaper than thai airways. But it mainly won me because of departure and arrival times in Sydney. Thai airways time is screwed for me living in Canberra as I have to stay in a hotel the night before leaving and the night arriving due to no transport back to Canberra. So in hindsight I'm actually saving around $600 by putting up with a shittier flight