Strange, i've had the opposite experience with flash, the one in the repos always gave me trouble. That was on Ubuntu anyway, never tried the Debian repo I always install it off the Adobe site.
Anyway, for the record and since you're pretty opposed to complications, building the .deb from the source is actually pretty easy.
Code:
apt-get build-dep conky && apt-get install devscripts dh-make
wget http://sourceforge.net/projects/conky/files/conky/1.7.2/conky-1.7.2.tar.gz/download
tar xvf conky-1.7.2.tar.gz
mv conky-1.7.2.tar.gz conky_1.7.2.orig.tar.gz && cd conky-1.7.2
dh_make -s
dpkg-buildpackage -b -j4 -D
cd .. && dpkg -i conky_1.7.2-1_i386.deb
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