Stantours (stantours.com) in Kazakhstan is well-regarded and very responsive to requests for travel support in Central Asian countries.

On the other hand, you can organise your visas for Uzbekistan and Turkmenistan yourself, because most companies that provide visa support for these countries will insist on you purchasing a hotel or tour package in exchange for visa support. I’m assuming you’re from the US — you can apply for a visa for UZ without a letter of introduction if you apply before you leave your country. For TM you have the choice of a transit visa (usually issued for 5 days, you need visas for the countries on either side of the transit, and don’t mention ‘tourism’ in your application) which does not require you to travel with a guide, or you can apply for a standard tourist visa which requires that you have a guide accompanying you everywhere outside Ashgabat. This can work out to be quite expensive. But once you make this decision getting the visa is relatively straighforward as long as you have the necessary documents (visas for neighbouring countries or tour booking) to support the application.

You no longer need a visa for Kyrgyszstan if you are in the country as a tourist for no more than 60 days.