Wilberforce Road - it's been on a while. Parking is a nightmare and it's an uphill walk to the station and any schools. Personally (but I'm biased) I'd go up the hill a bit, which will give you more choice of primary schools, and a better walk to the station, however, I know character houses are harder to find up there.
This might be a bit of interesting news, if you are still considering Saltwood - lots of parents are actively choosing St Augustine's over Saltwood, because it has a less pushy, starchy feel. Not this September, because there was a spike in population, but last September, they weren't full after the reception places had been given out.
Sandgate was our first choice for this September, but DD didn't get in. We live a distance which would have been fine every other year, but there were around 40 siblings which scuppered us. Yes, it's a good school, but the school we got has some points which I felt they did better, and it wasn't an easy choice. Ofsted ratings aren't everything....
Something - the houses round the Harbour area and bits of the East End are cheap for a reason, but yes, Folkestone is a fantastic place to live, especially for families.