Are you not going to see anything else in the countries apart from Bishkek and Tashkent? Samarakand, Bukhara, the lake and mountains in Kyrgyzstan??
Kyrgyzstan is an awesome place if you like nature - even two weeks wasnt enough!
By far my favourite 'stan.
I assume you'll have a local to show you around - it definitely helps in the 'stans.
Kazakhstan is fun too, but not too much to see. Uzbekistan got the culture, and Turkmenistan... is just weird.
Didnt get to Tajikistan, because I opted for spending 2 weeks in Iran instead.