way to vague. is this in an area that does NOT have smog inspections? if its in CA then a turbo is out of the question. if he has a load of cash then go turbo. to make the turbo worth while you need to really use the power it can achieve... this will be in the 450+ range. it will also need a forged block to handle the power, transmision, rear end, etc. the turbo costs, the essentials that will break cost.
supercharger will be cheaper and easier all in all. anywhere from 300-400 hp with ease. thhe costs of this will range in the 3.5-5k intead of 5-7k for the turbo.
if this is going to be a track car, and he has the cash... Turbo is the end all be all in my opinion.... HOWEVER, if this is going to be a daily (i think it is, considering he has a 04) then i'd suggest a blower.
Torinalth