wow man, you really got some things wrong here...
Ok first off... Dollar for Dollar Blower vs. Nitrous
Initial Cost: Blower 1,800
Nitrous: 800-900 (if you do it right)
Cost per bottle refill: 40-60 bucks... so lets see... 1,800 - 900 (difference in blower and nitrous price) = 900 ... 900 / 50 (refill cost) = 18...
So, look at the math there.. after you fill the bottle 18 times then you are at and OVER the cost of a blower...
Im sure you are going to spray more than 18 bottles worth in ur cars lifetime.. hell thats one summer of hitting the track every other weekend.
Now Power: 6 psi adds about 100hp.. give or take
and Nitrous well.. its variable most of the time and depends how much your tune can handle...
Blower has power 100% of the time.. all the time.. any time.. forever
Nitrous... well, lets hope you keep extra back-up of full bottles in case you get stuck in a race on low bottle pressure.
and lastely... Reliability and MPG
When I put my vortech on my car my hwy mileage jumped from 21 mpg to a consitent 25.5 mpg... yea thats right i actually GAINED gas mileage.. go figure uh? Well, the motor is running a lot more effiecent now ya know?
As far as reliability.. there is a reason you see several factory cars come with blowers and turbos.. its because they ARE reliable...
How many cars do you see come factory with nitrous?

(of course laws may prevent this but for good reason.. .high bottle pressures and explosive gasses.. you get the point, its a safety hazard.
So why do people run Nitrous? Lots of reasons, you can hook it up in a few minutes and get the extra power you need for the nights race.. OR, they are running very high compression and Nitrous is compression friendly where a blower isnt.. in your case you arent running high compression OR needing to win a race tonight.. save urself the trouble, just get a blower.. geez