We use 1.0 a lot in this house, it's very versatile as you can layer bubs if it get a little cooler. So I would get a few of them and maybe a 0.5 tog for the very warm days.

For cooler days we love Aden & Anais, their winter bags are four layers of muslin and are very cosy! They aren't togged though, it's just winter and summer bags.