If a turbo is sized correctly, and your not running some monster specialty unit, lag is a non existent issue. But as noted oil plumbing, water cooling for the turbo, and the air plumbing to get a intercooler (Water to air is more money but easier.)
The various M series superchargers will give you pep without a lot of stuff wrapped around it. Look at Ford installations, the SC thunderbird is a good example of a pretty bare setup, just for how to do it wihtout a really tough custom manifold.
If you take a look at
http://www.sdsefi.com/ they have some good tech pages including a manifold buildup which is well within the skills acquired in a night welding course.
Cheers.
Dave