Scalloway, Shetland - de-fisheye'd

I liked the colours in the sky on Shetland last week.

I took a few with the 10-17mm Fisheye, but I thought I would try and straighten out the horizons.

I used 'PTLens' plug-in for Aperture and straightened the first taken at 13mm and the second taken at 10mm.

I know nothing I use will ever be perfect, and quite liked 'PTLens', but is there anything else you can recommend ?