Another two-way dictionary that must be mentioned is the soon-to-be re-released classic by Dr. John C. Wells, a renowned linguist at University College London.
For over four decades his compact English–Esperanto–English Dictionary has been one of the standard reference works for English speakers, though unfortunately it has been out of print for some time. In March, New York publishing house Mondial will be releasing a new, fully revised and rewritten edition of this two-way dictionary.
Along with Benson’s Comprehensive English-Esperanto Dictionary, You should put Wells’ book at the top of your “must have” list. The price is discounted for preorders until February 28th.