There are other considerations:
1. the turbo works well with a good iron manifold, but a blower pretty much needs a real header ($$, noisy, only lasts a few years)
2. the underhood heat is much higher with a turbo
3. the underhood noise is higher with a blower
4. you have to figure out your pulleys to get the correct water pump, alternator, PS speeds, and the proper blower drive ratio, you may need a jackshaft. See my article:
http://victorylibrary.com/mopar/blower-drive4.htm
5. boost can be adjusted more cheaply with a blower by changing pulleys, but the load is constant (unless you use a Mercedes etc. electric clutch). A turbo is freewheeling and consuming almost nothing under light throttle
6. turbo boost with automatic is limited in 1st gear unless you have some stall speed, with a blower it can be at 1,000 RPM (although this may wreck the engine).