Best toys in our house would be wiggly waggler (on Purrs shop), Da Bird (also on Purrs shop), and anything with catnip (you've guessed it, PUrrs shop lol)!
Also Pets at Home sell mice with a movement activated microchip in them, so they squeak when they're being batted around, that's always pretty good fun.
Re collars, Max always wore one up until a few months ago. I would say defo microchip, and if you do get a collar, make sure its one of the breakaway ones (kittycollars on here do some nice ones).