ISO: Reliable.. But fun. Suggestions?

[Reed Hitchcock <hitch02@ibm.net>]

Maybe you folks can help.  I'm in the market for (yet another) car. 
Right now I've got the 100CSQW.  I just sold the miata to get out of
making car payments.  Here are my criteria:

1. No more than $5000

2. FUN to drive.  Especially on winding back roads.

3. Reliable.  This is going to be a commuting car.  It needs to work
regularly without a lot of maintenance.

4. Air conditioner. (this rules out, of course, most classics, but have
you ever spent a summer in DC?  This is a necessity)

5. Convertible would be nice, but at least a sunroof.

6. Prefer 4-cylinder (again, the commuting thing)

I'm not concerned about front/rear/all wheel drive, european vs.
japanese (American is not an option, in the interest of HANDLING). 
Here's where I am: An earlier Miata, coupe GT, Cabriolet, Nissan Sentra
SE-R, Prelude Si.  Any experience on these models?  Any suggestions for
more?  Know anybody selling one?  Help!   

TIA!

-Reed

100csqw
and nothing else.