I work on many ideas at the same time, if I don't I get pretty stale and start relying on crutches.
As for the horizons, I suck at PC in the digital darkroom. I want my view camera back. I want it back NOW. But, i can't really afford it, so, until you guys buy me a medium format Sinar with a digital back, you'll just have to live with my crappy perspective corrections. Somehow I even managed to make one roof line tilt one way, and the other tilt the other way. I figured I'd set it aside before I made matters worse.
As for RAW processing, I use Raw Photo Processor and post in Photoline, so I don't have a 'clarity' setting. I ETTR, and use gamma (brightness in the "Film-like" curve in RPP) to compensate and fine adjust with black point. I actually have an entire system for this which involves exposing for the hilights and processing for the shadows in a precise and calibrated way, but I don't really use the whole of it on a daily basis.
In this image, I used the Kodachrome 64 film simulation, brightness at 50 (default) and black point at 1.60. Everything else at null. So it was a pretty basic process. There was a lot of adjustment to color and saturation in post, giving it more vibrancy.