I voted speedy 30 in ebene. The idylle range is not as durable as the ebene or mono speedies - and since you will want a bag which will last you a long time - I went for ebene (as it has no vachetta either).
I also find the 25 is a tad too small... unless you are really really petite!
Hands down Idylle Speedy. To me, it's a very "think outside of the box" variation of the classic Speedy.