My two cents-
The LS is probably the most common swap option. It has the most support & is the most prevalent engine making it the easiest to install and operate/maintain.
The 5VZ is smaller and all it's power comes higher in the powerband. You're going to be spinning that engine/trans higher to see a marginal performance increase. There are superchargers available though. The native R series manual transmissions are a bit lighter-weight than the H series found in the 60. Getting to be an older engine at this point.
The 1GR powers a similar curb weight-vehicle and it's power curve works for the application. It hasn't been swapped into a ton of stuff, so you'll be spending more $ to work out the bugs. Super strong engine though. They're in a ton of 4runners/tacomas (still the engine for the 4runner), so supply is good. Manual transmissions are are out there, but not common. These also have superchargers available
The UZ family is a decent option. I don't know where
@dbbowen gets it that they're unreliable. If you're running more than a few pounds of boost (in anything other than the 89-94 1UZ), you'll want to do something with the bottom-end, but they're pretty stout engines. The power/displacement is there. If you want to run a manual, you'll need to cough up for adapters/transmission. Again, superchargers available.
1HZ/1HD-T are cool engines, the support is there... overseas. Gonna heavily lean on a diesel Land Cruiser specialist in the US though.
Cummins B series engines are torquey and relatively fuel economical, but heavy and tall. Expect to go SOA/heavy suspension. The 4 cylinder variants are about the same weight as the 2f. Packaging the engine with turbos & intercooler will be more than an NA V8.