I'm thinking about this issue for when I've passed my PPL and I've come to the conclusion that doing the Night course will be better in Winter. You are keeping current and learning something new plus you can do it at at civilised time and still hit the pub afterwards to relive/bore your mates with stories about it!
Aeros has got to drastically improve your flying technique - hasn't it? I'm looking at this element more from a safety point of view rather than fun - I may enjoy it more than I think but I really want to improve my control and have a better idea of what to do if it all goes pear shaped!
How about combining it with a holiday to the States?