Good list. Some things off the top of my head:-
- flight bag (can be anything from £10 from Argos through to £100's if you want a fancy one)
- fuel surcharges - some clubs charge others don't
- insurances - more important if overseas although to be honest I never got any
- calculator - get a decent one if you intend to go on to do the ATPL's, something like an FX-83 has everything you need and I found the hrs, min, sec function a must for long/lats and time conversions
- manuals - also include a confuser as well
Other things that are nice to have (also probably more dependent on what your club provides) but have found their way into my bag - fuel tester, various checklists, leatherman, torches (big 2 D cell maglite and a smaller pencil version), a snazzy plastic torch with green, blue, orange light filters.