If two hundred to four hundred dollars doesn't scare you, Micro Seven has a
very capable-looking talking multimeter called VM10 for 300 plus options,
or a less flexible one called VM10C for $200.   Does AC and DC volts, and
ohms.  No current ranges.

Their contact info is:
PHONE: 503-693-6982
FAX: 503-693-9742
E-MAIL: SALES@MICROSEVENINC.COM

There is also a much fancier setup from SpecialNeeds Computers for 2500
Canadian dollars.  It includes a six inch digital calipers attachment.
http://www.specialneedscomputers.ca/index.php?l=product_detail&p=841

For much less money Jameco Electronics has a PC board kit for $35 to build
an extremely basic talking meter that will divide a specified voltage range
into ten buckets and speak up to one second of recordable audio for each
bucket.  The board is set up to accommodate three different ranges by
shifting a jumper, but there is only one series of recordings.  This could
become a useful troubleshooting tool with some fooling around, I bet.
Pmail me if you're interested in me building one and seeing if I can make
it useful.

Yrs,
d