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@pajamas
well yeah I think it's fairly accepted that it's a better move to go for a single chainring setup, so if you get an old roadbike (unless it's a five speed) you'd at least be wanting to strip one of the chainrings off.
eg 52/42T at the front gives you options of something like 52/19 or 52/20 or whatever, or 42/14 etc. if you keep the smaller one. Gear inches are a matter of preference and practicality - people have posted about this before and Sheldon Brown has a nice table charting it.
It's slightly bewildering at first but you get hip to it.
I'm going to be doing the same thing this month with an old road bike but installing a different chainring.