All used Civics should have decent specification but the cheapest cars will be the entry-level 1.4-litre cars which are only available in entry-level spec (S originally and later SE). However the 1.8-litre petrol is a smarter choice and will suit more people as it's quite racy and frugal. The diesel will carry quite a premium used, but could be worthwhile if you cover more than 10,000 miles a year.
The Civic Type R has a strong following in the UK, so expect to pay top prices for used models. A full Honda service history is essential and avoid any cars that have been modified or not cared for - worn tyres and kerbed alloys are obvious clues.
The Civic might not match the equivalent Golf for selling price, but it shouldn't be far off - the Honda badge is fast gaining kudos and isn't far behind VW. If the looks put a potential buyer off highlight the excellent interior, practicality and reliability. An accurately priced example will sell in no time.
A GT will be easier to sell thanks to its extra equipment levels, although the standard car should still find a home relatively quickly.