Thanks for that, very helpful. Yes I think I may be kidding myself thinking that any DSLR will be a big improvement over any bridge cam. The technology seems very fast at the mo. Its early days for me and photography so I'm going to be doing a lot more research before I decide what I'm going to go after. Besides I'm just getting to grips with manual usage and not having many f stops and limited ISO makes life a little easier - even if it does limit my scale of pictures.
I totally understand the convenience thing, my s1600 fits in a small bag and can fit inside my wife's handbag haha - easy to take anywhere! I do like the idea of spontaneity in photography and to be able to grab a camera anytime and so with an slr that needs to be put together and carried about in a larger bag, you will only be doing planned trips.
Hmmmm.... I've defo caught the bug so I will be upgrading. But I'm just going to enjoy taking pictures for now and try not to be in too much of a hurry to have everything now!!