if its camping with kiddy you're looking at may i suggest the wild country monsoon?
its a semi-geodesic but i've been well impressed with the stability and the standard of build.
we graduated from a TN quasar upon arrival of the sprog, the monsoon has been up in all weathers in scotland - even went to arisaig in march and it coped marvelously with pretty fierce winds, glencoe produced heavy snowfall and this was handled with aplomb while the lakes were midge infested and the monsoon was big enough for her to play in without us being driven out of the tent.
its got enough room for the sprog and the logistics regiment which follows her about. the interior and porch are about the same size - absolutely massive.
not sure i'd spend the extra £250-odd notes on going from a robust 3/4 season tent to a mountain tent. i have no problem pitching the monsoon anywhere i can take the kid, the mountain tents are overkill for any pitch you can get your kid to...