Yes mate, your predictions are right, you will be a good techy one day!!! As I said, the trial by error grease monkeys usually end up the most clued up!!!
The benefit of a twin spool is a more faster pick up, your car will run rings around most Imprezas that you will come across, especially the green turbo 2000 AWD's as well as the WRX's. Maybe give a few STI's a good run for there money too.
The down side is that the two turbo's will be fighting each other, there is no lazy turbo here, just UFC!!!
As for the switch off the car business, I think you need to give those turbo's a looking over, maybe you need to get an oil catch tank fitted too. In fact that is the first thing to do as when you take a corner too fast the oil goes to the other side of the sump and for split second or so, you have no oil in the engine!!!
The car is good for the money. Just tidy it up and try not to blow it up!!!
Make it presentable and get shot of it. Put it on ebay, It will go quicker then it came in guaranteed.
Buy an Evo III and then talk to me.
El
lol siht wnaks and dangle berrys over heated threw the rad cap off couldnt really stop any wear safe now its as lumpy as a lumpy thing made of lumps missing and stinking of petrol just filled it on the high grade aswell... need a stainless headgasket do i need to change the head bolts? thats proberly why its been rnning poo latly he was telling me he had head ache.... 
