We;ve just moved and are near the North station (handy for commuters). Lexden is meant to be the posh bit. New Town has rough parts but some are fine as far as I can see. Or there are lots of pretty villages around, plus the seaside (Holland, Frinton)
Wivenhoe. Lots of students but mostly well-heeled commuters and villagey types; 15 mins drive from town centre, lots of great pubs and decent localshop or two. The rivetr is there as well and there is a station which has a train to London.