V6 swap Celica Options

[SaulGoodman]

Ive been really debating as of lately what I want to do with my ST. The 1.8 liter supposedly can put out solid horsepower with only forged rods and basic tuner upgrades on boost, but Ive been thinking about more torque with NA horsepower. An LS swap would be cool as sh*t but lets face it, too much work in a car not made for it. So a fwd V6 from Toyota is my next best bet, heres some of my choices.

3mz-fe w/ e153 - Best candidate with highest HP/TQ, but people say the motors are no good for boost unless you dump 3k to building the block. Any truth to this?
1mz - Numbers are too low, doesnt seem worth it in comparison to the others. Why or why not?
5vz-fe w/ e153 - Supposedly better for boost? Need confirm on it
2gr/1gr? - No idea how that would work.

I want to keep it FWD. Something "simple enough" to swap in and work day to day.
Which would be the easiest to source junkyard parts (axles, housings, whatever), providing the most reliable performance without sacrificing daily drivability? Ive heard a few people say 1mz/3mz are the easiest to fit in the bay while the 5vz is the most plug-and-play with the wiring. Or should I stick with a boosted 4 cylinder, maybe do something crazy like a K swap? This is all hypothetical, the build wont be for a while so keep it light. Im inexperienced compared to some of the old heads on here, but dang would a V6 Celica be fun. Im 100% in love with this platform, so in my opinion anything is worth the effort on it.

[Box]

Mounting is different for the A series engine and C series transmission, the wiring is different too. The GT has S series engine mounting and the S series transmission can be reused, the wiring can be reused for the BEAMS and 3S-GTE with mild additions/altercations. The ST has smaller brakes and drums in the rear, so that's a serious consideration when you're doubling power or more. I've been there done that, had a ST and the added complications weren't worth it. It's infinitely better to just start with a GT that already has all the fundamentals in place versus spending the money and doing the work to a ST.