Heading to BKK in August

I'm Plat on Delta, but I won't have a ton of miles in August due to a major redemption in July - so I'm going to have to pay for this ticket. I'd like to fly in first or biz to BKK, and am willing to switch carriers. Who has the best experience from East Coast US to BKK at a reasonable price? I'd love to give Emirates or Singapore a go.

Thanks in advance for any advice. Also, anyone stayed at any great Thai beach resorts?