Which is best optically wide and Teleconverter for Fuji HS30

Pl tell -Which is best (optically) wide and Teleconverter for Fuji HS30? This question may have been asked but I could not find answer.

I want to take Bird and wild life pics. For that purpose I need maximum tele and wide for landscapes. I know 24mm is enough still I want more.

On Ebay , Amzon many brands available, which to choose. Or I should buy Nikon Coolpix 510 which has built in 1000mm Tele. I know there is little deterioration in quality with converters but good makes does not make big difference much.
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THAKUR DALIP SINGH