turbo,
takes too much work to get the SC to keep up with a similarly boosted turbo. Also the torque in 1st is a pain in the ass unless you limit boost, which turbo already does with it's lag. If you do go with a SC I would say get a roots based one. Its instant and makes better power than a procharged car (from what I've seen). If you do, there is an incredibly effecient SC that came out by Harrop, TVS. Adds over 150 hp for our cars vs the m62 heaton and is almost a direct swap.
Also roots based sc's can be intercooled, i have one in my intake mani with laminova cores. It adds to blockage though.
all in all, like everyone said...go turbo and avoid dragging that SC in the upper RPMS.
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