You know if you read the modchip comparison chart earlier it tells you which one is the easiest to install

just look for chips with a lower number of solder points.
they're all the same damn difficulty it's just a matter of how many solder points you'd have to do
Personally if difficulty of install is your main concern I'd say go with a wiiFree easy connect kit or xecuter wii free kit.
both use 5 point quick solder connections which are the flat out "easiest to install" without question (not the best but they're the easiest). and they come preprogrammed but also make it easy to upgrade or change to a different firmware if you so desire
not to mention they're both dirt cheap selling for under the $15 mark.