chap....I hear what you are saying, just make sure you test drive all three variant' s before you decide (& particularly the cab., if you do want wind in the hair it ain' t much more than a Targa) but at the end of the day it' s whatever float' s your personal boat !
With regards to Litronics, I' ve got these on my current " steed" but can' t say I would rave about them, better yes, fantastic no ! Think I would be looking for a Bose sound upgrade, a few alloy interior add on' s to lift the cabin & a sports (10mm) chassis first !
As to facelift prices, remember most OPC' s have 5-6k in the cars, I know this gives you peace of mind. But also get looking at the sunday times/top marques (mags & websites) as long as they are C16 Uk spec & still under full warranty, you can also get the car checked out at an OPC for about £150. Let us know how you get on, whichever model you choose the 996 is a great series !