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Since you're going in March, you are rather limited as to where you can go. The Pamir region of Tajikistan will be "closed" that time of year. Hiking in Kyrgyzstan or Kazakhstan will not be available. So that really leaves you with Uzbekistan. The good news is because of the cold, there won't be any other tourists, so you'll have the sites to yourself.

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davo4040:
It would have helped if you had told us your interests.
Also try cross posting on the Travel Companions branch

''The good news is because of the cold, there won't be any other tourists, so you'll have the sites to yourself.''
I was there in December 2008, it was freezing but usually bright clear skies and almost all the sights were practically empty. Great for taking photos.

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You must plan on wet weather at that time of year. It can be either cold rain or snow. I lived in Uz. for 5 years so I am not blowing smoke. Even Turkministan was wet and cold in March.
However; it is not a constant rain/snow so you may catch a clear weather window. This is also the time the food selections are at their lowest. No fresh vegetables, fruits, or melons. You can always find fresh baked bread, you won't starve, and the large cities have food stores.
Tajikistan only has Dushanbe at that time of year; the Pamir mountains will still be snowed in. Khujand in the north is not worth seeing, I worked there 3 years, and Chaklosk is radioactive. It was a closed city where they made plutonium bomb triggers.
Uzbekistan has, Tashkent, Samarqand, Khiva, Bukhara, Kokand
Bishkek is 95% mountains so except for the capital and Osh it will be snowy.
Turkministan has, Mary, and Ashkabad
Kazakhastan is so huge it is hard to make recommendations, but better beware, thr Ruskies used KZ as a dumping ground for nuclear waste. There are actually villages of mutated humans around some of the sites. (BBC program) not my information.

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In Uzbekistan now. Freezing, slush rain and no tourists. The only warm yurt is the hi tech one with a restaurant in the middle of Tashkent. Bukhara and Samraqand hostels are only 50% heated at the moment. That said if you are hard and crave adventure heli skiing on a Krygiz glaciers may be a go in March, snow should be good till May.

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I would like to follow this thread, as I may be in the same region at the same time...
-TBri