For what it's worth, I've tried the following (I', 5'11" with 32" inseam):
1. Stock shield
- Holy crap this sucks. Buffeting and noise worse than any I have tried.
2. Cee Bailys +4
- Much better, but still too much buffeting and noise in all but full up
3. Cut down stocker
- no buffeting, somewhat loud, but useless as a windshield
4. V-Stream
- Best one yet. Least amount of buffeting and noise.
5. Tuning spacers (to tilt shield)
- No buffeting, noisy only when shields are down, so wear earplugs. Makes any shield better.
Thus ... for the money, start with putting some spacers under there to tilt the shield and then see what you need.