ok some amunition for you,
i was also looking ages ago to size up my GTi to a Seat Altea FR,
The boot in the FR (leon) is tiny in comparrison, so if you have a small family or have plans for kids, the boot in the Leon is pathetic!! WILL NOT FIT A PUSHCHAIR!!,The ride is harder then the golf, the interia is so plain and smooth looking, (ie no definition) if would make ann robinson's face look wrinkly!.
Its performance isnt as good as the golf, it does have 170bhp but runs outa puff at 4000 rpm.its also quite noisey, and is quite thirsty on diesel .If your buying on part finance, remind her that the seat will loose a large percentage of value, so you will always be in negative equity come part ex.If you do have a small family ,the altea is really only slightly bigger then the golf and is more appealing for the family man, given performance is similar between models,the leon, is claustrophobic and way smaller inside, but that idea of buying a Seat was dumped after driving off the forecourt on our booked testdrive,we were aloud it for 2 hrs and i was back to the dealer in 6 minutes!!! (only that long because i couldnt turn around any sooner).
Honestly stick to your guns, ok the golf costs more, but please do not make a big mistake i nearly did. YOU WILL NOT REGRET IT.