It's not like you are using up 150MB everyday. More like 40-50MB. So when that day comes, the rationing can easily make up for emergency downloads of drivers, software updates going up to 500MB and such.
uTorrent's scheduler is really good and so far has given me total peace of mind. I don't have any access to the computer in the office after all
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Even I thought that the 2mbps connection would just suck up the bandwidth and not give me freedom of surfing. But in reality I never even cross 4GB on the month. Of course, when one has the Home500 plan, the surfing has to be a little more conservative, though not in the extreme. Since you are anyway paying 900 for the UL, an extra 100 isn't all that bad.