Once upon a time we weren't having children.
We bought a house that was perfect for us (but no garage). Over the next 6 years we bought 2 new Elises, a motorbike, an Impreza and saw the world (well all the bits we wanted to Oz, 'Nam, Chile etc etc). We completely re-did the house. Had quite a nice time.
Then we had a baby, sold the house and bought a much bigger one. Then we sold the Elise, not because we had to but because we wanted to. Stopped the holidays (see baby) stopped going out (outgrown it).
If we'd bought a bigger house at the start and stretched ourselves we would be richer now with a smaller mortgage. But we wouldn't have had the trips, wouldn't have made the friends and wouldn't have had the fun.
I still have an Elise (of sorts - it's Neil's old one and have you any idea how he treats cars?) and we still are lucky enough to have enough money to do everything we want to do. Yes it would have been more sensible financially to buy a bigger place at the start, we didn't do it not because we couldn't afford it but because we didn't want to get a mortgage on both of our incomes in case one of us got a better offer

.
You only live once and I've trekked in Patagonia, chartered a boat with friends and sailed round the Galapagos, spent a month in Oz and met a lot of lovely folk and been to a lot of weddings all over the world in the back of it all.
I know others on my wage who bought at the top of the market and had a nicer house than us but spent most evenings sat in it.
I'm almost agreeing with McApe. Life's too short and if you can afford for your finances to be a balance you should take advantage of that rather than sinking them all into one thing (IMHO).
pete
'99 - '03 Titanium S1 111S.
'03 - '10 Starlight Black S2 111S
'11 - '17 S2 135R
'17 - '19 S2 Exige S+
'23 - ?? Evora