What's your favourite gear ratio?

I just got my first singlespeed bike but I'm unsure what gear ratio I should use. currently it's 42/16 but I dunno if that's the best bet for me.

the bike is only meant to be a pub bike and for the odd blast about town.

as the bike (se draft lite) is a cheap hack I don't want to spend too much on it so I'll probably stick with the 42 chainring for now but will I improve the ride at all by moving to a different freewheel (will also have a crack at fixed when I eventually get some spd's sorted) if so what sort of tooth count should I go for? more or less than 16?

I have ridden 42/15 for a year now with no problems on a fixed SE draft lite.
The bike is a piece of crap(soon to become my wet weather only bike) but will do great for pub runs.
I do feel the need for a bigger gear sometimes, but the chainring is hard to replace on the SE - you need to replace the cranks, and maybe the bb to get the parts to fit.