Thanks everyone. I googled the Yashica 24 - cheapest was over $400! Must be good ;-) I think I have decided on the 50 f1.4 (for the closer focussing), the 135 f2.8 and either the Yashica 24 or Zeiss 28 (whichever I find first at a decent price). Some Ext tubes also. Thanks for all the advice - much appreciated.