What 1fast400 said. The money you spend to buy one already modded and tuned by a reputable tuner will be much less then having it done yourself.
I can understand being a little hesitant to buy something already modded...especially with forced induction vs some simple bolt on mods...it all depends on what you want right now vs later.
Denofthievz mentioned new '04 or '05s for low to mid 30s...I would sell mine for MUCH less what it would cost to add a paxton, upgraded internals, new flywheel/clutch, DC Performance goodies, headers, etc to a new one costing somewhere in the mid 30s.