If you want color, and you want laser, virtually any HP with PS support will work fine under OS/2. They come in tabloid and standard letter/legal variants... duplex, and non-duplex. Networked, and non-networked (which can then usually have an HP JetDirect card/adapter attached to them).
Pretty happy with the CLJ4600 I am using. And looking at one of the 5000 Series (forget exact model at the moment) which supports the larger tabloid (11x17) sized sheets.
Robert