I just replaced mine on Sunday.
After a few hours of research online with the brands that are available for my Rodeo.
I went with the Koyo brand, they sell it on Rockauto under a different name.
Spectra and Vistapro were local options, but the reviews werent all that good.
Especially on the Spectra units. Koyo was/is a Japanese brand that also made OE radiators.
I got mine on eBay for $100. If you want a all metal radiator then get it at Radiator barn. They are more pricey than before now.
Mine is aluminum and plastic and perfectly replaced my original radiator without any problems.
I lost about half a quart of ATF. But since you're replacing your trans, fluid shouldnt be an issue.
If you havent already, get a trans cooler. It really does help.