I haven't seen many hoods available, Roush has the add on scoop but not really my style. I'd really like to get a GT350 hood depending on how much they cost.
Are there any other options that are fairly conservative?
Not many yet... AM seems to be moving very slowly on S550. Not unusual with an all new vehicle though. For one, R&D has to be done, and two, market analysis to make sure product lines will be profitable. There's simply not enough data yet, I would suspect.