i used 1×9 for about 6 months, 32:11-34, ive just put the granny ring back on, 1×9 is fine for trail centres but i feel the need for a granny on natural routes which make up most of my riding.
For 1×9 i used deore chainring sram 970 cassete and chain with the front mech left on with the limit screws moved and a long cage lx mech, worked fine.