Alaska Cruise lens selection?

The wife's talking about a cruise to Alaska this summer so I'm thinking about what lenses to take. I've got the DA* 16-50 and DA* 50-135 which will be in the bag but I'm in a bit of a quandary about what to do for longer reach.

I've also got the DA 55-300 (metal mount) and a monstrous/heavy K500/4.5. I could sell one, or both, and buy the DA* 60-250 or the DA* 300. Neither would give me the reach of the 500/4.5 but I think the increased resolution would let me crop if I had to and they're definitely going to be easier to cart around.

So if I buy one of the DA*'s, the question becomes, which is the better complement to my existing kit? The 60-250 or 300? Is there a noticeable difference in image quality between the two?

Thoughts?

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Chris
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http://www.pbase.com/sinnettc