Should I sell my SS-III to get a GT4?, I currently own a SS-III but is it worth upgrading to a GT4 Project? Options

[G4Frost]

As the description says I currently own a SS-III with a few performance stuff done to it but none major really only:
exhaust
intake(yea I know its a sin cause the factory one is SO much better performance wise but I bought it without the factory one in)
lowering springs
OEM lsd

In a few months time the cost of insuring a turbo car for me will be half of what it is now cause of my age.
So I was wondering if it is worth selling the SS-III for the extra 40-50hp and 4wd
if I get theGT4 I would probably plan on doing the exhaust, intake, intercooler, and a tune(with new ecu if needed I dont know anything about the ecu in these and tuning sorry)
does anyone know what kind of power gains these would make as I am looking for 315hp+ at the wheels if its short what else would be needed to get it there
or any better suggestions from someone that has done it before cause I am just going off posts online and don't know how true they are

I have heard people say that the GT4 is just so much slower and less responsive in the lower revs then the SS-III and I was wondering how true this is
Also that they are alot heavier because of the parts needed for FWD and this makes them a pain in the corners and if so what can be done to combat this and what kind of price tag am I looking at

I would be full on race tracking it but i would like it to be fun and with the potential in the future to get on the track while still being road legal.

any advice would be greatly appreciated

Here is my SS-III (and yes I do have the legit parts to match my brand stickers hahahah)

[Box]

Also more wheels moving the car.