A4000 RAM upgrade

[CRL]

Hi All-
I have a fairly stock A4000 desktop, 16 mg fast, 2 mg chip, A3640 cpu card with a Sonnet quaddoubler(50mh)68040 cpu chip.  I recently realized the advantage of running stuff out of ram instead of off the storage disks (duh?).  Now I have a lust for more ram, but no idea of what I should look for.  Any recommendations?  Keep in mind I'm an obvious cheapskate.
Yours
CRL

[CRL]

Thanks for the advice!
  I have FBlit and some other free and commercial (oxypatcher) speed-ups on my old A4000, and with the sonnet I clock out close to a vanilla '060 system according to AIBB.  If I splash out big $$ on this 'obsolete' system it will be to put a Dragon in my A1200, and retire the A4000.  Running the old hardware is a nostagia trip, but some of the old software has advantages for me.  I work in a "Laptop University", and the continual churning of patches and bug fixes and updates and 'improvements' means that I spend most of my computer time just trying figure out how to do this year what I learned to do last year.  Reasonably good software that is frozen in time allows one to go on to more and more sophisticated usages without devoting ones whole life to the effort.
Thanks again-
CRL