1) Post this in the Porsche forum, too, if you haven't already. Not very hard to guess what F-owners in an F forum will suggest.
2) Ferraris hold their price better than Porshes, if you dont 'drive them more than a little, and sell them off after a short ownership.
If a sunday trip and a trackday now and them is all you need from this car - I'd pick the F430 in a heartbeat.
3) Porsches can be used as everyday cars - that's not really the same case with an F.
If you need a useful and practical "everyday" car, the Porsche is the right pick.
4) They both handle like a dream - up to YOUR own taste which is better for you.
5) Reliability: Both have high quality. Porsche has a far better history of building high-milage, drive-them-till-you-drop, reliable cars than Ferrari.
You dont find many Ferraris that have survived 100.000 km
The F430 just might do that - but think about the depreciation. Hard to sell a hi-milage F with all those garage queen F's out there.
6) The 430 is rarer and looks more exotic than a 997TT (IMO).
A matter of taste - yes, but I believe there is more passion and excitement about the Ferrari brand than the P brand.
In the real world this may be perceived very differently.
You have indeed a luxury problem here
I wish you the best of luck poicking hte right car for you.