Have you used clear coats in the past? If you have, I would use what you are comfortable with. Any clear is going to have the same basic effect when you are finished. The difference alot of times is what kind of environment you are working in, what kind of equipment you have, etc. HVLP gun or Firehose? If it was me, I would use a high quality, catalyzed automotive clear coat.
At the auto parts store, ask for a clear coat that has a slow, or standard reducer. I wouldnt suggest anything with a fast reducer or hardener as it speeds up dry time. It may take you a little longer, but I think if you use a cc with a slower dry time you wont find yourself rushing to finish. Myself, once I start to rush because its drying to quick on me, I start to fight sags and runs.