Do you have any mods what so ever, or are you bone stock?
Personally I would go towards a turbo if you have the cash to do it.
Turbo
Pro's - Turbo's use wasted exhaust energy to provide boost, they will have superior horsepower and a fat torque curve starting at a realitively low RPM since a proper turbo kit will be providing almost full boost at 2300-3000 RPM, also no pulleys to increase boost just turn a knob.
Con's - Price, Installation, finding traction on street tires
Supercharger
Pro's - A little more affordable, less involved installation than turbo
Con's - It takes engine power to run a supercharger that's why a turbo will make more power at the same boost level, not to mention the boost and torque advantage the turbo has. You need to change pulleys to get more boost. Lot's of accessories to buy, i.e. pulleys, power pipes, intercooler, meth injection
Nitrous
Pro's - Affordable, instant power, fat torque curve, cheap adjustability for more power, easy install.
Con's - Having to refill the bottle, also has accessories to buy, i.e. bottle warmer, remote bottle opener, bottle vents, and running out of nitrous at the worst time.
Other things to consider are building a good bottom end for the motor to handle the extra power you are throwing at it with any of these options. If you go with a supercharger or nitrous you are going to want to add a set of nice headers and good exhaust, turbos will eliminate the need for the headers. Also you will need a good fuel system to handle boost, or any decent shot of nitrous. Now your stock suspension is in need of an update to handle the power, might as well throw a new transmission in there.
If you use any of these at a moderate power level you should be fine though. I would say 8-10 lbs boost, and 100-150 hp shot of nitrous. Sorry for the long post but that is my outlook, and I am sure I am leaving some things out.
Also, any of these give you a good starting point for future mods and make up for the lack of torque on the 2V mod motors. Heads,cams, intake, exhaust, and anything you would do to make the motor more efficient will be more benificial after a power adder than before in my opinion. In other words any three of the above will give you more power than a naturally aspirated motor for the price and you would still have a very peaky motor. Not saying you couldn't make the power with a N/A 2V.