Sorry I didn't answer the initial question - as iceblinker says, sell the rest and buy the 17-70 an 55-300. or buy one and wait to get the next.

I'm still dithering over whether to get the 55-300 or wait for the Sigma 18-250 HSM to take instead of the Bigma when I want to travel "light". Since the 60-250 seems as mythical as ever and the quality dubious it will have to be one of those too. And yes, I know the weight of the 60-250!

Mike-P I have a Tamron 28-300 and love it. It is currently on the Ds as Hubby's lens of choice, but it went on safari with me and to the US last year as my travelling light lens, and I was very happy with it.
Because he now uses it all the time I am left with the Bigma as my only long zoom, which can't be called travelling light!

When the photo downloader dialogue comes up click on advanced dialog. You can fill in your details under apply Metadata - you can fill in author and copyright. PSE will remember these and always apply them unless you tell it not to.

I add my name and copyright to the EXIF when I load the photos into PSE. I have it set up to do it automatically.

The best ones get printed. Either to hang on the wall, though I've not much wall space, or in photo books. Most get shifted off to storage, or thrown. Some get kept on the hard drive. A very few get posted here or for family and friends to see.

Sigma EX lenses tend to be very high quality, others are more variable. Some Tamron lenses are excellent, some not so good, being prone to CA.
There are great Pentax lenses, good Pentax lenses and OK Pentax lenses.
The more modern Sigmas are very good, and I can't see for paying the extra for a Pentax lens tbh, especially now Sigma have HSM lenses. Besides Sigma covers focal lengths Pentax don't.

The Expedition 5 is carry on legal on most airlines, but you would need to check what your airline allows. It will take up to a 12" laptop.

The Aero Speed Pack 75, will hold a camera with a 7.5" lens attached it says. It too is carry on legal.
Maybe you should find a stockist and take your gear along to try it out. Always the best idea really.

I have a Tamrac Expedition 5. I open it just enough to get the camera with attached lens (often the Bigma) out, without the need to open the whole thing up. The reason I chose that bag was because it will take the Bigma on camera or off, and leave room for lots of other lenses too, and it is (just) carry on legal. It is very comfortable, even when loaded to the gunnels.
It is heavy, though not as bad as that Kata!
Camera bags are a real problem though, especially for flying. I am hoping to get to a shop which stocks Think Tank bags to look at their range.

That is one huge bag Amin! Have you seen the weight of it . Way too big and heavy for me.

I'm still going to get a Jill-E when I can afford one. They really don't look like camera bags at all.

Kris I know what you mean!