Re: Advice required please.
I can't comment on the newer 'Ti' option package, but between the Progressive and Distinctive models (these are called Turismo and Lusso, respectively, in the UK I think) definitely go for the Lusso package. This gives you not only a few extra amenities (such as trip computer, cruise control, etc.), but also allows you to upgrade to 16" or 17" wheels without too much extra cost.
In my experience this was well worth it. My car is a Distinctive model with the only extra option 17" supersport wheels. I don't need anything else!
After reading many posts on this forum, as well as many reviews, I would also recommend the standard transmission as opposed to the Selespeed. I have driven a friend's Selespeed, and although it was kind of fun, it's not worth risking getting a faulty system that will need lots of attention.
I chose not to get the Navigator because of the cost-benefit analysis. I figured that for the driving that I do, I wouldn't use it that much, and in a few years, I would not get the value out of it in resale.
Another friend with the Navigator complains that you can't use the Map CD and play your CDs at the same time - so if you are going to get the Navigator system, consider getting the upgraded stereo/CD changer, so that you can load your maps and listen to tunes at the same time.
These are just personal reflections/ideas. I may be wrong on some of them, but I am very happy with my 1.6 veloce Distinctive (Rosso Alfa).