I think you've picked out a nice pair of tents, Angus. Super light weight is nice, but (heresy on BPL, I know) it doesn't always trump other concerns. Stretching your budget to the breaking point is never fun, and isn't fun ultimately the entire point of backpacking?
Have fun with your kids on all those upcoming trips your new, light tents will facilitate! A big wallet may buy you cuben fiber, but it can't buy those sorts of priceless family memories. :D