We've got a 1.6 Zetec estate, but it's a newer 55-reg model and I have to say it's the nicest car I've ever owned. Quiet, well made, well specced, fantastic handling, and the 1.6 is easily enough engine for it. (I've got a motorbike if I wanna have fun)
My dad had a couple of the earlier Focuses (Foci?) and I did think they felt and sounded a bit tinny TBH, but like every Ford we've had in our family (Mk2 Escort, 2 Fiestas, Granada, and about 4 or 5 Foci so far) they are silly reliable.
Personally, I'd avoid the 1.4 mainly on the basis that you'll struggle to get rid of it, you'll probably find a 1.6 for the same money and it won't be any cheaper in the long run anyway.
One tip – There's bluddy MILLIONS of the things out there, so don't settle for second best. Keep looking until you find the one you want at the price you want to pay. Hold off for a well maintained, clean one. They are out there!
🙂