The hard top is very expensive,£1850 from Autodelta.The officail Alfa item is £2k or more in the UK,so suffice to say most people don`t bother!The hood however is good ,at least for UK winters.(Not sure about snow,will it be garaged?)35,000km is not too bad at all for the year,but get the suspension wishbone bushes checked.Engine wise its the same as your 156.From postings on this site it seems that the Spider is generally reliable.It tends to be more small problems like rattles and minor electrical faults that you neeed to check for.
I have an Evo magazine buyers guide article which I scanned and can e mail if you like.
BTW Never seen a light green one in the UK. [img]smilies/smile.gif[/img]
Some days you`re the statue and some days you`re the pigeon