You're definitely right about the bang for the buck part, at least the initial cost is lower. But, everytime somebody on the juice wants to run me, it is prefaced with " as soon as my bottle pressure gets to "x" psi we'll run." Yeah right, check back with me 6 lights from here. Not to mention the bottle that runs out, usually at a really inconvenient time. Nope, not for me.
IMHO, turbo is the best, folllowed by the S/C and then N2O.
Tony