Setting up a poll such as this is rather like opening up a can of worms. The scope is so wide, and there are likely to be those holding widely differing opinions. For me there are also great differences between music I like playing and that which I like listening to. There are a number of pieces that are great to listen to, including some of the Eric Ball classics, which actually take an awful lot of playing, and you wonder whether all the effort is worthwhile.
I have selected Philip Wilby, as I feel he has given us a number of notable works, challenging for the players but approachable for listeners. Revelation and Dove Descending inparticular, when played well, can have a tremendous impact. As for other names, what about Ray Steadman Allen, Gilbert Vinter or Torsten Aagaard-Nilsen, not forgetting anyone who can write bass parts with sufficient interest and variety!