Re: Disc Brakes
Grooved discs are a good compromise between sturdiness and cooling - drilled discs offer the best cooling but can crack around the holes due to heat stress eventually. Grooved discs don't suffer this problem, but they're a little more abrasive so will wear down your pads more quickly.
You're right that performance braking components might need to be warmed up before they work well - I would add to this that they can also be quite noisy when they're cold. Cosmetically, drilled discs look great.
On a personal note, I do about 45 laps of the Nurburgring a year - 13.1 miles of hard acceleration and braking. I haven't taken the Alfa yet, but I last went in a Saab that weighed 300kgs more and had standard 308mm vented discs at the front, solid 280mm at the rear, and it stopped at least as well as my Gtv with its 304mm Brembos.
Hope that's helpful
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Driving: Vela Blue V6 Gtv 5spd, blue Momo leather
Gone but sorely, sorely missed:
Meteor Grey Gtv Lusso | 17" Teledials | Bilstein rear shocks | Ragazzon straight thru s/s centre exhaust | Some crappy Halfords air filter. Perfect condition and still 220bhp after 95k