Colt has kind of a lazy website, they only show about half the pistols they make, and some of the photos they do show are outdated.
Expect to pay around $525 for a blued 1991 commander, $600 for a stainless 1991 commander, $750 for an XSE commander and lightweight commander. Give or take $30 or so depending on where you are in the country. They don't offer two-tone guns factory, but their custom shop could probably make one for you. Early this year, Colt began using CNC methods for manufacture, which resulted in tighter slide and barrel lockups with less slide rattle. These models are easily identified by their stainless steel barrels. I believe these newly manufactured Colts are better guns than Kimber or SA in terms of construction, reliability, fit, and toughness. Kimbers have nice frames and slides, but are full of MIM internals, which some folks (including me) don't trust. Now, just watch a Kimber fan come and blow that last comment up. Colt uses two MIM parts, I believe (somebody correct me if I'm wrong). But they are not high-stress parts, and never would break anyway. SA are of good quality, but they are not fit as tight as a Colt. I know that they advertise forged or machined frames/slides, which is good. I think they are assembled in either Brazil or the Phillipenes if foreign guns bother you. Their base models sell at the same price as Colt's 1991, but I'm sure they don't have the same re-sale value. IMHO, if you've got less than $600 or so and you want a tight 1911, a Colt 1991 is your best bet by far.