Bangkok might not be the best place to burn points on hotels, unless you have a tight budget and want to stretch cash (and even then, if you're willing to venture outside the big chains, you'll find things to be quite reasonably priced). It's not that hard to find luxury accommodations at $100/night, and quite decent stuff for less than USA Motel 6/Super8 prices.
That being said, the Club Carlson properties, as mentioned by SanDiego1K, will probably meet your needs.