I suppose I should report back what happened after I tried the latest public (I guess) 2.0 build (well, it's the auto-update one). So basically, what happened was the fact that while none of my torrents seemed to get to my top speed (100 kb/s - blame living on a small town in Brazil for that), but they got to an acceptable download speed really fast whenever I started them (unlike 1.85, where they usually take 10 or so second to connect to some seeds, and then slowly accelerate). The problem I had was the fact that it kinda constantly crashed my router (a poor little D-Link 500B), which required either a physical restart of it or waiting a random amount of time. That didn't happen with 1.8.5 (which also didn't have problems reaching and staying at my top download speed), so I went back. Seeing how lazy I am to mess around with the configuration of everything, I probably won't go back to 2.0 for some time, I guess. By the way, thank you guys for the fast answers, but I believe I can keep using 1.8.5 a bit longer.
