Caldwellnc, as you have said, there are so many legitimate travel agents in Kenya, offering different kinds of packages. However, as a seasoned traveler, my advice to you is that too cheap turns out to be very expensive in the long run. An African Safaris should be memorable for years to come. Now, a good budget safari will cost you between $220-$250 per days per person, covering accommodation while on safari, three meals, transport and park entry fees. Note that entry fees to major parks is $90 per day per person, adding accommodation, gas, government taxes etc and you will discover that any safaris blow the $200 mark is a hoax or has a lot of hidden costs which in the long run turns out to be very expensive. Most travel agents will quote less than $200 per day per person and proceed to engage into criminal activities like colluding with gate clerks at the Park entry points to avoid paying Park entry fees, unnecessary delays from one point to another to skip some game drives etc. Masai Mara, Bogoria, Amboseli and Olpejeta are top on my list of what to do/ where to visit while in Kenya. Budget allowing, few days at the coast i.e, Mombasa, Lamu or Malindi are recommended.I have also pm you some other additional ideas in regards to outfitters etc. Hope this helps, good luck.
R.