Wotcha and welcome Eric
I drove an Integrale back in the day with a view to making a purchase, absolutely awesome car from a performance perspective - a proper rush however the interior colour scheme was hideous and they rusted something chronic...
so how does it compare - I got the same rush from owning the scooby - I am a new to subaru's myself, on the newer cars the sti variants have a wider track, bigger hubs to help with heat displacement protecting the bearings and bigger brakes - few mods for more power as well.
DCCD yep why not if you are in the market for something to put a smile on your face get all the bells and whistles as well dont worry about water injection for the intercooler though some cars have it some dont.
there is a really nice classic advertised at the moment but it has two doors (particularly special) so may not be as handy for your daughter although if she is old enough to scramble in and out of the safety seat she will be fine.
http://uk.subaruownersclub.com/forums/topic/1772-2000-impreza-p1-for-sale-mailage-8473/
whatever you decide keep us posted and dont forget to share some photo's ;)