First off, congratulations on your first LV. You'd love it ( and be addicted to it)!!
I'd pick the mono speedy, I love it so much I have both 25 and 30. I think 30 will suit you more because I find 25 too cute, IMO.
Also I feel that Mini lin's fabric is a bit thin. It might get snagged while in a resto or something but its nice to look at, very classy..not for me though.