NP. We're thinking of doing a South Mountain cruise sometime soon, but I'm about to list my home for sale, so right there with getting the house ready. I'll try and coordinate with the other owners after the holidays.
As for the different exhaust set ups, I can give you the cliff notes. My Alfa came with a crappy, poorly made set of 'straight pipes'. I took it off a few weeks after buying mine and added the Madness Monza setup. Since the car was already loud to begin with, it doesn't seem that bad. Personally, I come from the open header American V8 world, so everything is quite. I have to agree that most 4 cyl engines sound bad with exhaust w/ JDMs being the worst of the bunch. The Monza exhaust has no resonator or mufflers, but the car sounds surprisingly good. I can't think of another 4 banger that sounds as nice w/ exhaust.
The SuperSprint that was installed last week is a much more mature sound. For me, it's barely louder than stock. It does provide a nice tuned note with a bit more bass. For most casual drivers, it's probably the best route to go.