Speaking of Marriotts - the new Marriott Soi 57 is Latestay's '2500B, 5*, Mystery Hotel'. That's 2500 all in. Lots of cool bars and restaurants up Thonglor-Ekkamai way these days and it's close to Thonglor BTS. LINK:
http://www.marriott.com/hotels/trave...tel-sukhumvit/