going to Namibia (Windhoek)

hi all !
I'm planning a 1 week holiday in Namibia during February, therefore I'd like some tips and adv regarding doing a Protected content safari around Namibia. any safari company to recommend ? in the web I can find plenty of them, but I'm not sure how reliable they are.
I appreciate your help, and look forward to visiting Namibia.
best regards, Carlos.