14 x 23 x 56 would be my ideal kit. It's actually what I'm aiming for...just need the 56 and it'll be complete.
edit - The nerd in me decided to tally up the choices so far. This is not 100% accurate, it's just for fun. I wanted to see what the majority decided on. Check it out.
14mm - 38
16mm - 39
18mm - 9
23mm - 42
27mm - 9
35mm - 40
56mm - 57
60mm - 6
90mm - 18
So far, the majority of the people chose 14mm&16mm (close), 23mm&35mm (another close one) and 56mm. Feel free to draw your own conclusions