I'm an NFA dealer, and sell suppresors.
The best I've seen is a Glock with threaded barrel and silencer. It's on the expensive side but I don't think you'll find a better match of a threaded barrel & Silencer. The silencer alone is $400-$600.
Okay, first off, there are some problems there. The Glock is one of the worst guns to suppress UNLESS you use a suppresor with some sort of recoil compensation booster. You aren't going to get a can with a recoil booster for $400.
There are bascially three types of pistol suppresors, and this depends on your budget more than anything.
.22 cans are the simplest and easiest. They cost by far the least, even down to about $200 or so. The easiest/cheapest way to suppress a .22 is an already threaded Walther P22 or Sig Mosquito. All you need is a thread adapter to fit the can.
Then there are pistol cans that have no recoil compensation mechanism. Think of it this way, they are a tube with some stuff inside to catch the gas. Now when you hang a big heavy tube off the end of your muzzle, and your gun needs to still function, that big tube may impede the proper dropping and locking in most Browning style guns. Glocks and other polymer framed guns especially have problems with reliability with uncompensated cans. These basic cans are cheaper though. Best luck that I've seen has been with fixed barrel guns, or Berettas because they use locking blocks instead of Browning style tilting barrel lockup.
My favorite is something like an AAC Evolution can. They have a compensator inside that looks something like an M16 bolt. It compensates for the weight of the can on the end of the muzzle, and these cans work on pretty much anything. However they are going to set you back starting in the $800 range.
So really, the question is what do you want to spend?
You can suppress anthing that you can find a threaded barrel for. Sig has a factory threaded 226, but it has Euro pitch threads. No big deal, but just remember that when you order your can. The HK tactical is a popular one for .45, since it is already threaded. Berettas can be threaded by a smith, because the barrel on the 92 actually sticks far enough out to do so.
1911s work pretty well for gunsmith thread jobs also. If you get a Commander size slide, you can get a gov size barrel, and have it threaded down by a smith. There are also existing aftermarket barrels out there with threads.
If you have a barrel threaded, make sure it is by someone competant. Threads have to be perfectly straight, or you will get baffle strikes, and ruin your suppresor.
I hope that helps.
