>Thanks for all the replies.  It seems like it was a better
>question than I thought.

Well that is one of the beauties of this list, there is a large amount of
people experienced in a wide field of expertise who are only too willing to
make their knowledge available.

>This is a one-off hobby project, so component cost isn't much
>of issue. I'll go with the bigger pic because it is easier.

For this sort of use the advise given pretty well holds. The only thought
that I had was you may still need to think about how big a chip you need in
terms of pins available, as once you go beyond the 40 pin chips they are all
surface mount, which can be a fright if your not used to them. I don't think
you are using that many pins yet though.

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