So far Sasuke hasn't been, fortunately, the kind of guy who would try to surpass others by following similar steps and then try to get better at that same thing. That's why he interests Oro, who tried to collect all the techniques that others had created before. Sasuke does share his powers with Itachi, but they are brothers and he even has Itachi's eyes now, so it can hardly be helped. Thus I imagine Sasuke would feel fundamentally inferior if he tried to beat Naruto's Kyuubi powers by obtaining a Kyuubi of his own. Of course it would be different if the dark Kyuubi himself decided to dive inside Sasuke. But wouldn't the beasts rather be free of ninja and wander the lands on their own?
I had accumulated about 15 eps (not counting the weird mecha eps I skipped). It was quite sweet marathoning them!