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Since my car sits outside most workdays, I'm worried about protecting the interior from sun damage with spring/summer coming. At some point, higher-end cars starting having UV-blocking windshields (my '02 Saab has this). But I haven't found any info on whether LS4s have this feature. If not, I'm thinking of adding a retractable sunshade like the Eclipse. Had this on my last car, and it was barely noticeable when open, and very fast and easy to open/close.
You could always put a high percent tint on the front to make sure the protection is there. -- Especially if your other windows are tinted, it would not be noticeable.