Thanks, thanks, thanks!!
I really didn't expect to get all these answers so fast!
Believe me I learned a lot reading you!
I got good advices from almost all of your messages, and I got the point that first I need to think about the limitations with my current gear and what I expect from a new lens/camera.
I should really reply to each of your messages, but that would not be possible for me now - I need to do my luggage right now, I am heading to Thailand and Vietnam for my honeymoon!
So, summing up, I decided to invest in a lens now (actually I will buy it in Bangkok). I have now to choose if I go for the Canon 15-85 or another one you suggested, the 10-22 or equivalent.
The 15-85 will allow me to go just a little wider, but I like it covers a wider range, and as many times due to my work I can't take all my gear with me to the street, that would be good. I also saw some photos and found it is
As I like taking photos to architecture and landscapes, the 10-22 will be great also...I like wide angles.
On the tele side, I think for the moment I am covered with the 55-250.
BTW I think I will buy some ND graduated filters for my landscape photos. As soon as I come back from my trip to Thailand and Vietnam I will share with you the results.
I take advantage to share with you some of my photos.http://www.flickr.com/photos/l_c_b/sets/
As an enthusiastic hobbyist, your comments will be highly appreciated!
Also perhaps looking at them you could see which lens would be better for me.
What it is for sure, in 2014 will dedicate time to learn how to use Lightroom and others.
I think that would be a clever investment...
Again, thanks all for your great suggestions!!
Have a Happy New Year folks!