Depends how much money you have to spend to be perfectly honest.
If you havent got much and you are abit of a beginner then Hassocks would be your best bet in my opinion as it caters for all levels of golfer and is only about £500 a year i think.
Lewes somebody said was below par...not in my opinion, the greens are always immaculate and the course is never as far as i am aware closed due to the course being on chalk. It is quite pricey if i remember rightly though, i play there 2 or 3 times a year as the father in law is a member, it gets windy but is a good challenge.
the views from up there are also excellent.
Have you looked into H/Heath golf Club ?....ive only ever had a couple of lessons there but it looks very nice indeed.
Spot On.
Pycombe also good as like Lewes you can play there all year round . Its a shame about the last 3 holes as they let the rest of the course down. Should also consider Brighton & Hove.
Singing Hills nice in summer and its a shame that Mid-Sussex gets so wet as its very welcoming.