My vote:
The empty parking lot between Bishop's Landing and NS Power. I know there was another project slated for this lot (looked like a cruise ship?), but it would be cool to have an actual tower reaching for the skies just at the waterfront, to welcome incoming ships and keep the skyline interesting - plus, being at lower elevation, I can't see it interfering with the viewplanes so much (it's also
in line with Maritime Centre from the Citadel vantagepoint).