Hi There!
Check out the Sofitel Silom and Triple Two Silom.
Great hotels in a great place with an amazing price considering their star ratings.
If you're looking for special & luxury hotels check out differentasia.com
http://www.differentasia.com
They do all the top hotels so don't expect budget, but they present them nicely with independent reviews and photos. Prices also reasonable.
Hope this helps,
Seaton123