OK I will address what I can!

**But, I am considering trading up (down ?) to a used Ferrari. **

The trading down part concerns me.  If you really think an entry level
car like Corvette is superior to a Ferrari, I greatly discourage you in
moving forward in your purchase.

**I have found a 1995 355 spider about $10-15,000 more than  the 328 I
was looking at. @ $55,000.
So this cost would be about $ 70,000.**

70k for a spider with 20k miles is pretty much right on.  But of course
if you can bat your eyelashes and get a discount, by all means.  It's a
good mileage for the car.  Super low miles can mean the car sits for
extended periods and may have more "gremlins" than a regularly driven
car.  F-Cars do not like to sit.

**I expect that maintenance costs are more costly than 328s. However,
do the costs make the car a non logical choice ? I make a comfortable
living  but I am not rich by any standard.**

You are right about that.  The 328 is rock solid, and are I say has the
most spare parts available for any F-Car models.  My first car was a
328.  I drove the hell out of it in both Texas and Arizona.  Car never
overheated and was a champ.  But the 355 is so much more modern.  The
355 will be several orders of magnitude more expensive to service.

**Im aware of the fact that most any Ferrari needs a 15,000 and 30,000
mile tune up. How much do those cost  ? **

In the range of 6K USD

**What other tune-ups may it need in between those mileage slots ? **

The same as any other car.  Religious oil changes.  If the cars is not
going to be a daily driver and does not already have a bettery tender
or trickle charger, GET ONE.  F-Cars eat  batteries when they sit
unused.

**I think the 355 styling is beautiful and I am falling in love with
this car.**

I agree.  The 355 is a beautiful car.  I am a Testarossa owner and the
355 is the little brother, or is it little sister? :-)

**I have also read about some 355s catching on fire. Something to do
with the manifold heat and fuel lines being too close. What other
problmes does this car have ? Cracked Heads ?**

I guess now is as good a time as any to stress and attempt to
overstress getting a PPI done before you fork over any of that money
stuff. PPI is a Private Party Inspection.  If you go to ferrarichat.com
you can find a relutable one in your area.  It is paramount you spend a
little money to get a PPI done.  If the seller is not willing to do a
PPI, turn and walk, no run away.  Remember this ain't no Corvette.  You
cannot go down to the local auto parts shop and get replacement
hardware.  The caar needs to be tip top, or the seller needs to factor
that into the purchase price.

In reference to fires, this goes back to proper maint.  Stay on top of
it and you should be fine.  Electrical issues occur on these cars.  But
then again show me a Ferrari that doesn't have this problem :-)
Italians can craft a beautiful car, but electricians they are not.

**My dream of owning a Ferrari is soooooooo close its nerve racking. **

I have been there.  Please keep a level head and make sure you buy the
right F-Car, not the first one you see.  I will stress again that a PPI
is so very important.  Owning an F-Car needs to be a positive
experience.  Not a negative one.

To finalize, and it's a big one.  Find out what your insurance costs
will be!  I pay over $600 a month for 2 F-Cars.  One I put only 300
miles on this year (if that).  Insurance can be a deal breaker for many
a F-Car dreamer sadly.

Please don't be rushed into a purchase.  Do your research.
ferrarichat.com is a great place to talk to other owners and you can
get the full scoop on the day to day issues that arise in a 355 owners
life.  But it will also make you want that car more. :-)   Don't rule
out that 328, it's a great car.