Looking to pick up an electronic caller for hunting predators and varmints at night species in this priority order are:

Feral Hogs
Foxes
Coyotes
Raccoons
Bobcats
Anything else...

I want to get quality but not spend a ton, looking for a single speaker with remote. Really liking the Fox Pro Inferno, lots of good reviews, comes with a pretty good assortment of calls.

Q1: Are there any other calls I should consider in the 200-300 dollar price range?

Q2: any special techniques/ tricks I should try my first time predator hunting?

For what you are wanting for now the inferno is good to go.
With the new remote its perfect.
need one that's louder them look at the Banshee
Play the wind always!, cross breeze or in your face, set up where you feel the animal will come from.
Keep looking and be ready fast.

I've had just about every foxpro out there, the inferno is good, fusion is good, wildfire isn't bad(remote can be sucky sometimes), ignore the spitfire, the higher up you go in price you get better volume, remotes, and bigger sound libraries ( as well as a bunch of other crap you will never actually use). The lucky duck revolution is getting a lot of attention as of late as well. Regardless of unit, buy good batteries!

One thing I cannot stress enough is to learn how to use mouth calls. Not only is it the bread and butter of predator calling but your e-caller(no matter how many times foxpro touts reliability and customer service) will fail you, and its generally at the worst possible time. It's good to be able to salvage the day when you have a good lanyard of calls.

As said above watch the wind if you want foxes and coyotes. 9 times out of ten they will attempt to play the wind.cats don't care. If hunting at night, Scout and plan your stands in the daylight. Try to pick areas that give you some elevation. Don't skimp on the light. Don't start calling till your comfortable and ready to shoot. It can happen in the blink of an eye.

Night calling is fun, and effective, day calling is more fun and rewarding for me.

any good reccomendations? I've got a bunch of surefires with red covers (old 9P with a clicky tailcap puts out about 120 lumens)

what should I upgrade to?

Thanks!

I've used one of these for about 2 years now.

https://www.gofoxpro.com/site/products/hunting-lights/fire-eye-scan-light-kit

4 different colors instantly. Brightness and focus adjustments.

By "using it" I mean literally every night.

Excellent light.