Mines NATASP, the 500 BHP version is supercharged. I've vever driven the supercharged version, but mine is a real hoot, and very easy to drive, being very tractable, and also having avery wide power band, at least 4,000 RPM.
The later V6 is a much less complicated animal, with oil scavenge and pressure pump gear driven inside the sump, altenator at the rear, oil filter canister screws onto block, loads less internal parts, 4 valves per cylinder rather than 5, 120 Deg V so lower C of G, lighter, cheaper, smaller etc. I could go on, but suffice it to say I would have chosen the V6 had it been around at the time, in 2005.
Having said that The V8 has been a fantastic engine, and no real problems so far, so I'm happy with my lot.
If the price is right you would not be dissapointed.
Matt, if you need the benefit of my experience please blat mail me with your contact details and I can help you a lot here.