I second Tarptent -- I have the Double Rainbow, and although it's advertised as a two person it could even sleep three depending on the age/size of your daughters.
In my experience Tarptent is generally of comparable weight to most "UL" gear -- not as light as some but with a larger footprint and volume. The build quality is great (everything is made in the USA!), and, in my opinion, it is a bit more rugged than some of the other UL tents and can take a little more abuse. Price is great, too, especially compared to some of the other offerings (Big Agnes, North Face, MSR, etc).
The downside is that you must seal the seams yourself, or have Tarptent do it for an extra $35.