A very good start to what will certainly become a great collection!
What's to add next? Some thoughts:
Big-bore revolvers: 44 Mag is perhaps the most versatile (S&W 629 Mountain Gun or a Ruger Redhawk are great choices); either in .45 Colt are also great choices (I have both Mountain Guns and a SRH in .44Mag). I also like the 610 in 10mm/.40 -- great gun and one revolver adds two excellent calibers to your collection. The Ruger Alaskan in .454 Casull / .45 Colt is a great revolver as well. I've recently added the S&W Thunder Ranch .44 Special to my "must have" list. And today I got to handle the Thunder Ranch scandium frame performance center .44 acp, what a fantastic gun! If you're really drawn to the Judge (I'm not), you might wait a bit as the S&W Governor is just hitting the streets and for about the same retail price it's a much better gun (scandium allow frame, 6-shot, .410/.45 Colt plus .45 acp, S&W quality and service). So, you can either buy that when they become available or wait for the Judge prices to come down.
Semi-auto: You've got a Glock and a 1911, which covers the two most common, and superb, platforms. I like the S&W M&P .40; add a laser grip and you've added a new dimension to your collection. Sig Sauer makes a two-barrel gun kit for 9mm / .357 Sig, which is an nice combo and, again, adds two calibers to your collection. I also very much like the Springfield XD Compact series, where you can have a short grip for conceal carry, or a longer grip (extension as part of a 2nd higher-capacity mag) for non conceal. Since you already have a Glock and a 1911, you could look to add another. A Glock in .40 would be a great choice. A 1911 in either a new caliber (perhaps 38 Super!) or in a compact style. I'm looking for a 2nd 1911 to add a .460 Rowland conversion kit to, bringing .44 Mag power to a 1911.