For starters, probably want to look at 1.375-24 HUB compatible stuff so you're not locked into a mounting system unless you pay someone like me to convert it (which, BTW, is really borderline on the Banish cans; I will probably refuse to convert them after this batch).
Another consideration of course is whether a dedicated 5.56 can is the right choice, or if the flexibility of a .30 cal is worth a little extra length and weight or higher muzzle end SPL (remember, your port noise with an AR or other autoloader is going to dominate anyway with most decent cans, so backpressure is a major consideration, and sometimes a .30 is a better choice).
And then use type; outside of the TBAC Dominus (which is a .30 cal), titanium is generally going to be a poor choice for a hard use carbine suppressor. Thunderbeast developed that one properly for the application with geometry and coatings, but most any other is going to be prone to sparking and suffer accelerated wear in that role. Titanium is a very tough and pretty strong metal, but it's not hard/abrasion resistant, and heavy rapid/full auto fire will cause baffle erosion quickly. In general, for hard use, you're going to want hardened stainless steels like 17-4 & 15-5, nickel alloys like heat treated Inconel 718 or even cobalt alloys like stellite. Of course you're going to pay more for the exotics, so balance need with budget. For most people's uses, stellite and inconel are not needed, especially if a muzzle brake mount is used on the short barreled things that are really hard on baffles.
As I said, the Polonium is definitely a better option than the banish. I don't really care for the aesthetics personally, but I know Andrew, and regardless of some personal faux pas, he and his team did their homework and are making a solid product.
Of course we have our Five By Five, which is a 5.56 K can that is 6.5mm capable and punches above it's weight. Tubeless fully welded 17-4 H900 stainless, 1.6" x 5", 10.8 ounces
https://www.eccomachine.net/product/five-by-five/
The aforementioned TBAC Dominus, but as I said, it's a .30, and it's gonna be well outside your stated budget. Fits your short & fat criteria, though.
The YHM offerings are alleged to be much improved with with the 3rd generation as far as flash and backpressure, and if that's true, they're a good value, but I haven't seen a Turbo T3 or other current model yet so can't say. The T1, T2 and first gen Turbo K are very flashy and gassy.
Rex Silentium is a popular budget brand, and they're OK for the money, but they use a "one size fits all" approach with baffle geometry and spacing, just change bore size and baffle count, so the optimazion is a bit lacking. It's an option if you want to keep cost to a minimum without buying junk like the Po Boy or (now defunct) rebel cans
SilencerCo stuff is decent, and they have a solid warranty. Tend to be kinda heavy, though.
Griffin makes some very good 5.56 models, Austin is a stand up guy with a passion for this stuff.
Liberty Precision Machine is a newer company, but Riley is a bright kid who spent the time and money to R&D his stuff right. Only .30 cal options at this time, though.
The newer OSS cans seem to perform very well on ARs, but they use a completely proprietary mount that should not be changed on the can, and that nobody makes adapters for using with other suppressors at this time. We're investigating making a 1.375-24 adapter for the OSS muzzle devices, but awaiting quotes on custom carbide inserts to cut the 12 TPI left hand modified square threads. They're also not particularly budget friendly.
There are others that are very viable, but this is a starting point.
