Which ECU?

So I've had issues with losing power in my truck,done everything I can mechanically,thinking about buying a new ECU, I have the 98 5vzfe Mt.

I'm seeing numbers all across the board for prices of used one, anywhere from $200 up to $800, then there is the new ones for like $1,300.. that seems crazy,but what is the best overall choice? And which brand or quality should I use?

I have this motor in a 91 Toyota pickup,not sure if it makes a difference,didn't know about the harness if it is different?

Thanks for the help!!

 

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