I've owned a fair few 'bents now. My 1st (and in hindsight fastest and best) 2 wheeler was a Bacchetta Strada high racer. So much easier to ride than the mid and lowracers that followed. I (wrongly) assumed that lower meant faster, but when you factor in setting off from lights, uphill starts, and slow speed maneuverability, a highracer (imho) is by far the best tool for the job. I miss the Strada so much that I'm always on the lookout for another (or a Corsa.)
As for fairings. Very expensive, though you can make your own. My home made effort is mainly for weather protection, though it does roll very nicely when I'm cruising at 22-25 mph. Don't think I'd bother with anything more than a rear fairing on a 2 wheeler though, as I'd be scared of side winds. On a 2 wheeler, I'd just make a small rear box/fairing, and some home mad wheel covers. I never got round to fitting a rear wheel cover on the Catrike 700s rear, or the Strada, and there's no need on my current rear faired Trice, but this took me a couple of hours, and not much money. Most expensive bit was the carbon wrap, but if you just spray painted the correx, would cost around 15 quid.