Well the supercharger setup will cost you more to setup to begin with and you will still be running stock 7mge internals.
Expect for the price to jump as soon as you crack the engine open. Which is more than likely what you would have to do at a certain point. It might not be in the beginning, but you may need to later on.
The beauty of the turbo is the ability to turn up the wick and extract more power when desired i guess, the supercharger on an atmo engine with a jury rigged fuel system will have limitations at a much lesser level.
If you want to do the supercharger go for it, im not going to sell you on the turbo, hell the insurance wont make much difference between the two either.
What i see is factory turbo setup or dodgey rigged supercharger on an atmo engine. Reliability is key to a good investment.