they certainly wouldn't want a weakening bloodbath when the Nazi's still existed
Nazis had been dealt with by the time of Postdam although Japan was still warring. I think that some form of the "collective leadership" (call it "junta", if you want, although most popular meaning of this term assumes military leadership and most of Commie leaders were not army men) will be set with very uneasy alliance of Beria and Zhdanov (due to die in 1948) at the helm. Other members will be Molotov, Malenkov, Kaganovitch, Khruschev, Voznesensky (very likely), Kuznetsov (possibly). Old and harmless Kalinin (due to die in 1946) will be probably kept as figurehead.
At the very beginning international consequences will be very minimal, as Soviets will want their spoils of victory. But with Zhdanov dying in 1948 and both main fractions in Soviet leadership (Zhdanovites and Malenkov-Beria) being well aware of serious weaknesses in the Soviet economy, stuff can happen. Today I'm in the mood to explore "positive" alternatives, i.e. post-Stalin leadership becoming less rigid ideologically.
Speaking about international affairs, Sovetization of Czechoslovakia is not predefined conclusion. With non-communist Czech leadership seeing USSR as next best thing which could happen to their country after pilsener beer, less rigid Soviet leadership might prefer to "Finlandize" it, with tons of love from ordinary Czechs and Slovaks instead of traditional Finnish Russophobia being extra bonus. Germany will be most likely united as neutral state, with non-alignment and neutrality being protected by Constitution (much like Austria OTL) and both Allied and Soviet forces will leave it's territory. Hungary and Poland will still be sovetized, although possibly in more mild form, closer to Yugoslavian "people's socialism". Sovetization of Romania and Bulgaria is bound to happen, as local Communists were hugely inflyuential OTL. Fate of China remains great big unknown. Massive Soviet support, necessary for Mao's victory over Kuomintang, may not materialize in this mellower world, although Communists in China are more than able to hold their own without foreign meddling. And Americans would not be able to support Kuomintang, as it would mean Soviet support for Mao. Break-up of China (much like Vietnam OTL) could follow. Marshall plan will be much less favourable for Western Europe than it was OTL, as there would be less need for USA to re-build Western Europe as bullwark against Red Scare.
Internally USSR could move in the same direction as China under Deng Xiaoping OTL. Parallel market economy for consumer goods and government ownership and regulation of the heavy and defence industry, utilities, transportation etc.